Trek Line Elite Flat Pedals Review: What the Specs, the Pins, and the Flat vs. Clipless Research Say

Pedals are the most overlooked purchase on a new bike, partly because many bikes do not include them and partly because the choice looks simple: flat or clipless. In practice it is a decision about your shoes, your confidence, the terrain you ride, and how much you want to think about your feet. A review of a single flat pedal is a good excuse to look at what is actually known about that decision, which is less than the internet's certainty suggests.

This review covers the Trek Line Elite Flat Pedal Set (Trek model 5306307), which Trek lists at $59.99. Trek sells three flat pedals with similar names (Line Comp, Line Elite, Line Pro), so check the model name when you shop.

This is a research review written from Trek's product page and from published studies. Dated checkpoint updates, written from real notes, will be added later, as explained in the review section below and in our longitudinal review program article.

What You Are Buying

The details below come from Trek's U.S. product page for the Trek Line Elite Flat Pedal Set. Trek notes that weights may differ in final production and that it can change specifications at any time.

Two details are worth underlining. The first is the weight. Trek lists 342 grams and does not say whether that is one pedal or the pair. A pair of nylon platform pedals at this size is plausibly a few hundred grams, but we are stating only what the page says. If weight matters to you, put the pedals on a scale. The second is the product's intended use. Trek's description calls it the "Line Elite MTB pedal," and the page copy talks about everything from enduro to dirt jumpers. It is a mountain bike pedal. That is not a flaw for gravel use, but it is a reason to understand what you are buying.

Trek's own page for the Checkpoint SL 5 AXS says that bike ships without pedals and recommends clipless road pedals for control and efficiency. That recommendation is the manufacturer's view of its own bike, and it is worth weighing against the research below. It does not make a flat pedal wrong. It means that if you pick flats, you are choosing a different priority than the one Trek recommends.

Platform, Pins, and Bearings: How the Design Works

A flat pedal gives your shoe a platform to stand on, and everything that keeps your foot from slipping comes from the interaction between the platform, the pins, and the sole of the shoe. The Line Elite's approach is a "virtual concave." Trek says the pins are placed to create a concave feel on a platform that is actually flat, so the shoe settles into the middle of the pedal and is held by pins around it. The pins are steel and replaceable, and the body is a nylon composite.

The size of the platform matters. A 113 mm by 99 mm footprint is large enough to support most of the ball of the foot and the arch for typical shoe sizes, and the 18 mm height is thin enough that the pedal does not raise your foot much. The footprint also determines how many pins can contact the sole. More pins spread across a larger area give more grip but also more resistance when you want to reposition your foot, and shoes with softer, grippier rubber soles interact with pins differently than stiff-soled shoes. This is general engineering reasoning, not something Trek or a study measured for this pedal.

Sealed cartridge bearings are the part of a pedal you rarely think about until it fails. Sealed cartridge bearings resist water and grit better than loose bearings, and Trek's page lists them for this pedal. The same page sells an axle rebuild kit for Line Pro and Line Elite pedals, which tells you the axle and bearing assembly is intended to be serviceable rather than disposable. The spec table's wording, "bearing/bushing," is less specific than the product copy's "sealed cartridge bearings," and we cannot say from the page alone which parts of the pedal use which. That is a minor point, and it is another reason to treat the page as a manufacturer description, not an engineering drawing.

The thread is 9/16 inch (15 mm). That is the common thread for adult crank arms, but Trek's spec for the Checkpoint's SRAM Apex crank does not state a pedal thread, so we have not verified that they match. The odds are high that they do, and it is worth confirming before you buy. As is standard bicycle practice, the left pedal threads in the opposite direction from the right, so the left pedal tightens counterclockwise as seen from the left side. Grease the threads when installing.

Flat vs. Clipless: What the Research Shows

The loudest claim in cycling pedals is that clipless pedals are more efficient because they let you pull up on the upstroke. The verified research is more modest than that claim.

Mornieux, Stapelfeldt, Gollhofer, and Belli (2008) compared three conditions in 15 people, 8 elite cyclists and 7 non-cyclists. Each pedaled at 90 rpm at 60 percent of maximal aerobic power on single pedals (the study's PED condition), on clipless pedals, and on clipless pedals with a force feedback that cued them to pull up on the upstroke. The abstract reports no significant difference in pedaling effectiveness, net mechanical efficiency, or muscular activity between the single pedals and the clipless pedals. Actively pulling up increased the effectiveness of the upstroke, by 86 percent for the cyclists and 57 percent for the non-cyclists, and increased activity in the biceps femoris and tibialis anterior muscles, but it also reduced net mechanical efficiency, by 9 percent for the cyclists and 3.3 percent for the non-cyclists. The authors concluded that the shoe-pedal interface itself did not significantly influence cycling technique during submaximal exercise.

That is a small laboratory study at a moderate effort, and it should not be stretched. It does not test sprinting, steep climbing, or very long rides. It does not test how well each system keeps the foot in place on rough ground. And it measured efficiency and technique, not how people feel or how many injuries occur. What it does show is that the idea that clipless pedals make steady pedaling automatically more efficient is not supported by this study, and that deliberately pulling up on the pedal cost efficiency in the same experiment.

On the biomechanics of the shoe-pedal link, Gregor and Wheeler (1994) reviewed the literature in Sports Medicine and described the shoe-pedal interface as the mechanical link between leg and bike, one that can create a smooth transfer of energy or abnormally high repetitive loads. They noted a high incidence of lower extremity injury in cycling and said that recent evidence suggested pedal designs that allow the foot to rotate (float) reduce trauma while maintaining power output. That is an argument about float and foot position, not about flat versus clipless as such, and the paper dates from 1994. A flat pedal gives you complete freedom of foot position, which is a kind of float with no limits, and a clipless pedal with free float gives you a controlled range. Neither is established as better for your knees by the sources we found.

FitzGibbon, Vicenzino, and Sisto (2016) reviewed interventions at the foot-shoe-pedal interface, such as wedges and orthoses, in competitive cyclists. They found 11 articles, concluded that these interventions alter lower-limb kinematics, and noted that conclusions about efficacy and long-term response are limited and that more high-quality studies are needed. That is a useful reminder that even the well-studied corner of this topic is thin. Davis and colleagues (2011) measured plantar pressure with clipless versus toe-clipped pedals in a pilot of 7 bikers and 11 volunteers and found that clipless pedals produced higher pressures that were more spread across the foot, with the sites varying between individuals. Toe clips are not flat pedals, so that result does not answer our question, but it does show that the pedal type changes where force lands on the foot.

The honest summary: we found no verified study showing that flat pedals make you slower at a steady effort, and none showing that clipless pedals reduce injury. The practical differences are retention, control, and convenience, which are real but are not captured by the lab studies above. Experienced riders choose clipless for the security of being attached to the bike on rough or fast terrain, and choose flats for the freedom of putting a foot down fast. Both are reasonable.

Injury and Safety Considerations

The injury literature we verified is almost entirely about clipless pedals, and it comes in the form of case reports. Patel (2004) described three off-road cyclists with isolated soft tissue injuries to the right lower leg caused by the chainring while they struggled to release their feet from clipless pedals, and concluded that correct adjustment of the pedals to allow quick release is required. Parker, Patel, and Devarajan (2011) reported a displaced hip fracture in a 38-year-old club cyclist who could not release his feet while slowing to a stop because his clipless pedals were set up incorrectly, and who had not returned to cycling at six months.

Case reports show a mechanism is possible. They do not tell you how often it happens, and they cannot tell you the risk relative to other pedal types. We found no comparable verified study of injuries specific to flat pedals, so we cannot say that flats are safer. What we can say is that the failure mode described in the case reports, being unable to release the foot in a fall or a stop, does not apply to a platform pedal, because there is nothing to release. The pins that give a flat pedal grip are also steel and sharp by design, and a slipped foot or a pedal strike can put a pin against a shin or calf. Trek does not quantify that risk on its page and we have no study on it, so treat it as a common-sense caution, not a finding.

Reflectors are the other safety item. The U.S. Consumer Product Safety Commission's bicycle regulation (16 CFR 1512.16) says bicycles shall be equipped with reflective devices and calls for an essentially colorless or amber reflector on each pedal, among other reflectors. That regulation covers bicycles as offered for sale. The Checkpoint ships without pedals, and Trek's page for the Line Elite does not mention pedal reflectors, so we cannot tell you whether these pedals include or accept them. If you ride in low light, you will want other lights and reflective elements regardless, and Maryland law, when a bicycle is used in low light or poor weather, requires a white front lamp visible from at least 500 feet and a red rear reflector or an alternative rear light. We cover lighting in our front light review.

Finally, a note on footwear and falls. Whatever the pedal, wear shoes with enough sole stiffness and grip to stay on the platform, and a helmet. That is basic safety guidance rather than a finding from the studies above, and flat pedals do not substitute for either.

Using a Mountain Bike Flat on a Gravel Bike

The Checkpoint SL 5 AXS lists 42 mm tires, a drop handlebar, and a 1x12 drivetrain, and Trek recommends clipless road pedals for it. Whether a flat pedal suits the way you ride is a question about your use, not the pedal's quality. These are the real trade-offs.

• Shoes. Flat pedals work with ordinary shoes, which is the single biggest practical advantage if you do not want to buy a second pair or you want to ride to a coffee shop and walk in. Soft, flexible soles flex over the pins and can make long rides tiring on the arches. Stiffer soles spread load better. Shoes designed for flat pedals exist, and Trek sells some, but we did not research them, and the shoe is where your money will go.
• Stopping and dismounting. On gravel you will occasionally walk a steep pitch, hop over an obstacle, or put a foot down on a loose corner. Flat pedals make all of these easy, since your foot is never attached. This is the main reason many riders new to gravel choose them.
• Retention. On rough or washboard surfaces, a foot can bounce off a platform in a way it cannot off a clipless pedal. The pins and a snug shoe reduce this, but they do not eliminate it. Some riders find the lack of retention tiring on long descents.
• Cornering and pedal strikes. A platform pedal has no cleat, so there is no cleat-to-ground clearance issue, but the platform edge can still strike the ground in a lean.
• Weight and bulk. At a listed 342 grams (for one pedal or a pair), the Line Elite is not a lightweight road pedal. The difference between a per-pedal and a per-pair figure is large, so check before you decide it matters.

Combine these and a reasonable summary emerges. Flat pedals suit riders who value easy dismounts, ordinary shoes, and low stress, particularly while they are still learning how they want to ride. Clipless pedals suit riders who want a locked-in feeling and are willing to buy shoes and learn the release motion. If you are unsure, flats cost little to try, as the cost section shows, and you can switch later; the reverse is not true if you have already bought shoes and cleats.

Maintenance and Spare Parts

Flat pedals are low maintenance but not no maintenance. Pins wear, get bent in rock strikes, or loosen. Trek sells a Line Elite Pedal Pin Kit at $13.99 and a Line Pro/Elite Pedal Axle Rebuild Kit at $21.99, according to the prices on the product page when we read it. That is the clearest evidence in favor of this pedal for people who keep their gear: unlike a sealed throwaway pedal, a rebuild path exists and is priced.

A sensible routine is to check pin tightness occasionally, grease the pedal threads when installing, spin the pedals by hand to feel for roughness, and replace the pins before they wear flat enough to lose grip. We have not tested the service life of the bearings or pins, and nothing on Trek's page states a service interval, so we will not invent one. Our checkpoint updates will report real wear observations when we have them.

What It Costs Per Ride

The cost math uses the $59.99 list price. The arithmetic is trivial and still clarifying, because it shows how little a pedal costs when you spread it over use. The scenarios below are hypothetical, not predictions, and they ignore pins, rebuild kits, and shoes.

The point of the table is not the pennies. It is that the pedal is a rounding error next to the bike, and the real cost question is the shoes, which we have not priced here and which are a separate purchase. If you add a replacement pin kit ($13.99) and an axle rebuild kit ($21.99) at their current list prices to the $59.99 list price, the total reaches $95.97, which is still below the $164.99 Trek lists for its Kovee Pro clipless set.

Where It Sits in Trek's Pedal Lineup

Trek's product page shows how the Line Elite compares in price with others it sells. These are the prices listed on that page, and we did not verify weights or specs for the alternatives, so this is a price ladder, not a head-to-head review.

The Line Elite sits in the middle of the flat pedal range. The step up to the Line Pro costs $50 more at list, and the page does not give us enough detail to say what that money buys beyond a higher tier. The step down to the Line Comp saves $22. Without verified weights and specs for each, we cannot claim the Elite is the best value, and we would not want you to buy it on that assumption. What the table does show is that a clipless pedal on the same page costs about two and three-quarter times as much as the Line Elite, before shoes and cleats.

Who Should Buy It and Who Should Skip It

It makes sense if you want flat pedals for a bike that ships without any, you want to ride in ordinary shoes, you value easy dismounts, and you like the idea of replaceable pins and an axle rebuild kit instead of a disposable pedal. It is also sensible for a rider who is new to gravel and wants to keep the option of clipless later without committing to shoes now.

Skip it, or look at other pedals, if you want the lowest possible weight, if you ride long distances on rough surfaces where foot retention matters, or if you are following Trek's recommendation for clipless road pedals on this bike. Skip it, too, if you have not confirmed that the thread matches your crank.

If your main goal is cardio that supports lifting, the pedal is a minor variable. Time on the bike matters more, and our guides to building a cardio base for lifters and slow steady-state cardio explain how to fit it in.

What Buyers Report

Owners on Trek's product page are positive about these pedals. The sample is small, about a handful of written comments, so treat the picture as rough.

• Grip: Several owners say they are very grippy, including on single track, and a few moved to them from slippery stock pedals.
• Build quality: Several describe them as sturdy and well made, and one said they outlasted a prior set of pedals that wore out after thousands of miles.
• Platform and looks: One owner noted they are slightly larger than stock. Owners like the color choices and easy installation.
• Breakage: One owner reported the pedals cracked in two places and said they would pick a cheaper set next time. Since only one comment mentioned it, we cannot call it a pattern.

Takeaway: buyers like the grip and the build, and the page offers too few comments to say much about long-term durability.

How HonestLifter Is Reviewing This Product

This is a research review built on Trek's product page and the published studies. HonestLifter's plan for each product is a written review first, then dated checkpoint updates at 30, 60, 90 days, 6 months, and 12 months, backed by our own notes and added to this page as they are written.

The Bottom Line

The Trek Line Elite Flat Pedal Set is a sensible, serviceable platform pedal with replaceable pins, a rebuild kit, and a mid-range price. It is a mountain bike pedal that works for gravel if you want the freedom of flats, and it is not the pedal Trek recommends for the Checkpoint. The research we could verify neither condemns flats nor crowns clipless: one small lab study found no significant efficiency difference at moderate effort, the injury papers are case reports about riders who could not release clipless pedals, and the foot-pedal biomechanics literature is limited.

Buy it for the shoe freedom, the easy dismounts, and the low price of entry. Confirm the thread and the listed weight before you commit, and watch this page for our dated checkpoint updates.

References

1. Mornieux, G., Stapelfeldt, B., Gollhofer, A., & Belli, A. (2008). Effects of pedal type and pull-up action during cycling. International Journal of Sports Medicine, 29(10), 817-822. doi:10.1055/s-2008-1038374. PMID 18418807.
2. Gregor, R.J., & Wheeler, J.B. (1994). Biomechanical factors associated with shoe/pedal interfaces. Implications for injury. Sports Medicine, 17(2), 117-131. doi:10.2165/00007256-199417020-00004. PMID 8171222.
3. FitzGibbon, S., Vicenzino, B., & Sisto, S.A. (2016). Intervention at the foot-shoe-pedal interface in competitive cyclists. International Journal of Sports Physical Therapy, 11(4), 637-650. PMID 27525187.
4. Davis, A., Pemberton, T., Ghosh, S., Maffulli, N., & Padhiar, N. (2011). Plantar pressure of clipless and toe-clipped pedals in cyclists: a pilot study. Muscles, Ligaments and Tendons Journal, 1(1), 20-24. PMID 23738240.
5. Patel, N.D. (2004). Mountain bike injuries and clipless pedals: a review of three cases. British Journal of Sports Medicine, 38(3), 340-341. doi:10.1136/bjsm.2002.003616. PMID 15155440.
6. Parker, J., Patel, N., & Devarajan, G. (2011). Proximal femoral fracture in a man resulting from modern clipless pedals: a case report. Journal of Medical Case Reports, 5, 219. doi:10.1186/1752-1947-5-219. PMID 21649917.
7. U.S. Consumer Product Safety Commission. Requirements for bicycles, 16 CFR 1512.16 (requirements for reflectors), retrieved from the Electronic Code of Federal Regulations.
8. Maryland Transportation Article, section 21-1207 (bicycle lamps and reflectors), Maryland General Assembly.
9. Trek Bicycle Corporation. Trek Line Elite Flat Pedal Set and Checkpoint SL 5 AXS Gen 3 product pages, trekbikes.com.

Product details were taken from Trek's U.S. product page and may change. HonestLifter carries no affiliate links. This article is educational and is not medical advice.