---
title: "Long Cranks for Tall Riders: Why 175mm Isn’t Enough"
description: Discover how long cranks benefit tall riders, how to choose the right crank length, and why 180mm–220mm options may improve fit and performance.
image: https://blog.zinn.bike/hubfs/long-cranks-for-tall-riders.webp
---
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# Long Cranks for Tall Riders: Why 175mm Isn’t Enough
TECHNICAL GUIDE
# Long Cranks for Tall Riders: Why 175mm Isn’t Enough
11 min read
Sep 25, 2026
Team Zinn Cycles
Sep 25, 2026, 3:51:34 AM
[Team Zinn Cycles](https://blog.zinn.bike/author/team-zinn-cycles)
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If you’re a tall rider, you’ve probably sized up everything on your bike except one part: *the cranks*. You went with a larger frame, wider bars, and maybe even bigger wheels, but the crank arms are still 175mm, the same length you’d get on a bike built for someone half a foot shorter.
That’s because crank length doesn’t scale with frame size. Most manufacturers cluster their road cranksets around 170mm, 172.5mm, and 175mm, no matter how tall you are or how long your legs are. So you can end up with a bike that fits you everywhere else, but a pedal stroke that’s proportionally too small for your body.
Not every tall rider needs longer cranks. Crank length is a fit decision that depends on your inseam, riding position, cadence, and terrain, not your height alone. But if your legs are significantly longer than average, moving beyond 175mm can bring your pedaling proportions back in line with the rest of your setup. A proportional crank length can also really help improve the overall fit and riding position on your bike.
In this blog, we’ll discuss why 175mm became the standard, how to figure out the right crank length for your inseam, and when it is actually preferable to go longer.
## Why Do Most Bikes Come With 175mm Cranks?
The popularity of 175mm cranks doesn’t mean 175mm is the ideal length for every rider. It largely stems from industry convention, component availability, and the compromises involved in designing bikes for a broad range of cyclists.
Most major manufacturers concentrate their road crank offerings around 170mm, 172.5mm, and 175mm. Some groupsets extend to 180mm, but longer options become increasingly difficult to find.
That creates a sizing problem for exceptionally tall riders. A bike may be available in XXL or larger, but the crankset may still use a length designed for a much broader range of riders.
In other words, scaling up the frame doesn’t necessarily scale up the drivetrain.
A tall rider can therefore end up with a large frame, wide handlebars, and appropriately sized wheels while still turning 175mm cranks. If their legs are substantially longer than average, the crank circle may not be proportional to their leg length.
## How to Choose the Right Crank Length for Your Leg Length?
The most practical way to think about crank length is in relation to inseam, rather than height alone.
An approximate crank-length range of 20% to 21% , and even up to 21.6% of inseam length should be a starting point. To calculate it, measure your inseam and multiply it by 0.20 and 0.21.
For example, consider a rider with a 36-inch inseam:
- 36 × 0.20 = 7.2 inches
- 36 × 0.21 = 7.56 inches
- 36 x 0.216 = 7.776 inches
Converted to millimeters, that’s approximately 182mm to 192mm. The upper end of the range would be 21.6% and at a 36 inch inseam, that is a 197.5mm crank.
That puts a rider with this inseam considerably beyond the 175mm cranks commonly supplied on production bikes.
This proportional approach isn’t a universal rule for every cyclist. Crank length involves tradeoffs, and riders can adapt to different lengths.
The practical point is that inseam gives you a more useful starting point than height alone.
## What Do Longer Crank Arms Actually Change?
A longer crank increases the radius of the pedal’s circular path. That changes the mechanical relationship between your foot, knee, hip, and bottom bracket throughout each pedal revolution.
For a tall rider with long legs, this can make the pedal stroke feel more proportionate. Lennard Zinn, founder of Zinn Cycles, has consistently maintained that crank length should be proportional to a rider’s leg length. Reflecting on his [1996 crank-length testing](https://blog.zinn.bike/why-proportional-length-cranks), he says the test “showed the benefit of longer cranks in producing more power for tall riders.”
[Custom cranks](https://www.zinn.bike/custom-cranks/) are a better option for riders who cannot find the right bike for their size.
There are several potential reasons a rider might prefer them:
- **Proportional pedal stroke:** The pedal travels through a larger circle relative to the rider’s leg length, making that pedal circle proportional as compared to average sized riders on average length cranks.
- **Mechanical advantage:** A longer crank provides a longer lever arm at the pedal.
- **Climbing:** Longer cranks can be particularly appealing when producing high torque at lower cadences.
- **Rider comfort:** Most tall riders report that proportional cranks feel more natural.
- **Better overall fit:** Crank length becomes part of a complete fit rather than an isolated component choice.
- **Better Muscle balance:** The proper range of motion allows for more even use of all of the leg muscles, which can lead to less imbalance in muscle activation. This means less tight muscles and less joint pain.
Anthropometric differences influence the optimal relationship between crank length and cadence, with taller riders tending toward longer crank lengths and lower cadences in its model.
## Is a 200mm Crankset Too Long?
Not necessarily.
A 200mm crankset will look extreme compared with the 170–175mm cranks commonly found on production road bikes, but you should consider crank length relative to the rider.
[Zinn Cycles](https://www.zinn.bike/) has been producing [custom long cranks for tall riders](https://www.zinn.bike/custom-cranks/road-and-gravel-bike-cranks/long-road-gravel-cranks-180mm-to-220mm/). We've offered integrated-spindle custom cranks from 190mm to 220mm, and our current long road/gravel selection includes lengths from 180mm to 210mm.
| We also have many real-world examples: a 6’8” rider who switched to 200mm cranks on a custom[Clydesdale Draft gravel bike](https://blog.zinn.bike/review-andy-rudeens-clydesdale-draft-2xl-gravel-bike-purchased-8/12/2019). After about 350 miles, he said the bigger pedal stroke felt good, and climbing got easier. *This is just one rider’s experience, not a scientific study, but it shows why some very tall cyclists look well past 175mm. We receive messages on a weekly basis from tall riders who are loving their new proportional crank length.* |
| --- |
The important distinction is that a 200mm crank isn’t automatically appropriate simply because you’re tall. It needs to work with your inseam, frame geometry, bottom-bracket height, gearing, cadence, and riding style.
## When Do Tall Riders Benefit From Long Cranks?
Longer cranks matter most when they solve a real fit or performance issue.
### Riders With Long Legs
A rider with an unusually long inseam relative to their height may benefit from looking beyond standard crank lengths.
### Riders Who Prioritize Climbing
Longer cranks can provide additional leverage and may suit riders who naturally prefer a lower-cadence, higher-torque climbing style. Proportional-length cranks are ideal for riders looking to maximize climbing performance.
### Riders Who Want Proportional Equipment
If your bike has been custom-sized with a longer reach, higher stack, larger wheels, and other components scaled to your body, a standard 175mm crank may be the one component that remains undersized.
### Riders Who Feel Cramped
Crank length can influence saddle height and the overall relationship between the rider and bottom bracket. Consider it alongside the rest of the fit rather than changing it independently. When you increase your crank length, you will also need to lower your saddle by the amount of crank length increase. This means you will have less drop to the handlebars if you leave your bars at the same place. This can be great for tall riders who are often stuck on bikes where the saddle is so much higher than the bars. However, if you like the amount of handlebar drop you have, you will want to also lower the bar the same amount you lowered the saddle.
## How Do Longer Cranks Affect Ground Clearance?
One of the biggest considerations when moving to long crank arms is clearance.
A longer crank brings the pedal farther toward the ground at the bottom of the pedal stroke. On a road bike, this can increase the risk of pedal strikes when cornering. On gravel bikes, technical terrain, rocks, roots, and ruts can make clearance even more important.
That’s why you can’t simply install a 200mm crank on any bicycle and expect it to work properly.
The frame’s bottom-bracket height, crank length, tire size, pedal dimensions, and intended terrain all need to be considered together. A bike designed around a 175mm crank may not have adequate clearance for a much longer crank. Generally speaking. A maximum of 200mm crank can be installed on a stock bike without too much issue with ground clearance. Riders doing this conversion on their bikes will need to be more aware of pedal placement and avoid pedaling through turns. Proper technique is go through corners with your outside foot down, which will provide plenty of ground clearance. We don’t recommend anyone going longer than 200mm on a stock bike.
This is one reason custom crank selection works best as part of a complete bike-fit process.
## How to Choose the Right Crank Length
Don’t choose crank length based on height alone. Start with your inseam, then consider how and where you ride. Your bike fitter or crank specialist should evaluate:
| **Factor** | **What to Consider** |
| --- | --- |
| **Inseam** | Your primary measurement for proportional crank selection. |
| **Saddle Height** | Longer cranks change the relationship between the saddle and pedal. |
| **Riding Position** | Aggressive road positions may favor different crank lengths from upright or endurance setups. |
| **Cadence** | Longer cranks can encourage a different cadence and gearing strategy. |
| **Terrain** | Climbing and technical riding introduce different requirements. |
| **Bottom-Bracket Height** | Essential for maintaining adequate pedal clearance. |
| **Experience** | A large change from your current crank length requires an adaptation period. |
Once you know what to look for, the next step is finding a crankset that actually offers the length you need. That’s where options built specifically for tall riders come in.
## Zinn Cycles’ Long Crank Lineup
For riders looking specifically for longer road or gravel crank arms, Zinn’s [Long Road/Gravel Cranks](https://www.zinn.bike/custom-cranks/road-and-gravel-bike-cranks/long-road-gravel-cranks-180mm-to-220mm/) range covers 180mm to 220mm. The selection includes custom Zinn Split30 cranks and Clydesdale road cranksets, giving tall riders options that extend well beyond what mainstream component manufacturers commonly offer.
The range includes:
- **180mm:** A useful step beyond the common 175mm standard.
- **185mm–190mm:** Longer options for riders with greater inseam requirements.
- **200mm:** A substantial option for very long-legged riders.
- **210mm–220mm:** Specialized lengths for riders whose proportions justify exceptionally long cranks.
These custom cranks are ideal for road and gravel applications.
## Take Your Crank Length Beyond the Standard 175mm with Zinn Cycles
[](https://zinncycles.com/contact/)
If you’re a tall rider with a long inseam, you shouldn’t have to choose your crank length simply because 175mm is the longest option commonly found on production bikes.
The right crank length can be part of a more proportional setup, particularly when your frame, saddle height, and riding position have already been tailored to your body.
[Zinn Cycles](https://www.zinn.bike/custom-cranks/road-and-gravel-bike-cranks/long-road-gravel-cranks-180mm-to-220mm/) offers custom road and gravel crank arms from 180mm to 220mm, including 200mm options for riders who need substantially more length than conventional cranksets provide. Whether you’re looking for a modest increase to 180mm or need a specialized 200mm crankset, Zinn can help you explore a crank length based on your measurements and riding needs.
Want to discuss custom cranks for your build? Find the right length for your measurements and riding needs.
[Contact us.](https://www.zinn.bike/service/contact-us/)
## Frequently Asked Questions
### Can I install longer cranks on my existing bike?
In some cases, yes, but you need to check compatibility first. Bottom-bracket standards, spindle configuration, chainline, drivetrain compatibility, frame clearance, and pedal clearance can all affect whether a longer crank will work on a particular bike. We recommend no longer than 200mm on a stock bike. You will have to be more aware of pedal placement and avoid pedaling through turns. You will need to lower your saddle by the amount of crank length increase. So if you switch from a 175mm to a 190mm crank, you will need to lower your saddle by 15mm.
### Will longer cranks require different gearing?
They may change how a particular gear feels because crank length affects leverage. However, you don’t automatically need different gearing when moving to a longer crank. Your preferred cadence, terrain, fitness, and drivetrain range should determine whether gearing changes are worthwhile.
### Do longer cranks make a bike harder to steer?
Crank length itself doesn’t directly determine steering. However, moving to a significantly different crank length can alter your pedaling mechanics and may require adjustments elsewhere in the bike fit. Steering behavior is primarily influenced by frame geometry, wheel size, fork geometry, and cockpit setup.
### How long does it take to adapt to longer crank arms?
Adaptation varies considerably between riders. A small increase may feel familiar quickly, while moving from 175mm to something like 200mm represents a much larger change. Starting with controlled rides and allowing your body to adapt before judging the setup can be useful.
### Can long cranks be used for bikepacking and loaded touring?
Yes, they can be used for loaded riding when the crank length fits the rider and the bicycle has sufficient ground clearance.
TE
##### Written by Team Zinn Cycles
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