Why Are Mountain Bike Cranks 175?

The shift began when one major component manufacturer began including 175mm cranks in their MTB groupsets, and the rest of the industry quickly followed.According to Lori Barrett of ROTOR Bike Components, the shift began when one major component manufacturer began including 175mm cranks in their MTB groupsets, and the rest of the industry followed suit.Despite the fact that studies have proven that longer cranks do not necessarily provide higher power, riders and the industry have remained staunch supporters of the old paradigm.

Can you tell the difference between 175mm and 170mm cranks?

On my bike, I swapped out the cranks from 175 to 170 mm. My SX Trail has 170mm arms, however the arms on my other three bikes are all 175mm each. I CAN detect the difference, but it isn’t a significant change at all (obviously the SX Trail is a very different bike to ride compared to the others anyway).

Are mountain bike cranks too long?

While some companies specify 170mm cranks, they are frequently only available in the smallest sizes. Mountain bike crank lengths, on the other hand, appear to be too lengthy in general, according to the research. Because many riders prefer shorter rides, why isn’t anything being done to make the present lengths more suitable for them?

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What size crankshaft do I need for my mountain bike?

With a few exceptions, the majority of cross-country and trail-oriented mountain bikes on the market now have 175mm cranks. While some companies specify 170mm cranks, they are frequently only available in the smallest sizes.

What is the average crank length for a bicycle?

The three most often used crank lengths for bicycles are 170mm, 172.5mm, and 175mm. The length of the crank is measured in millimeters. The size of your bike’s frame will most likely determine the size of your bike’s wheels. Small bikes typically have 170mm cranks, medium bikes have 172.5mm cranks, and big bikes have 175mm cranks.

Are 175 cranks too long?

Basically, Shimano believes that 170 to 175mm is the ″Goldilocks″ range of crank length for the majority of individuals and the majority of bicycles.

What does 175 mm crankset mean?

#2 December 29, 2006 Only this particular user will be displayed. The crankarms are either 175 or 170 millimeters in length. It will be especially beneficial to people who have shorter legs and/or knee difficulties to have a shorter crankarm. Additionally, the 170 will provide you with 5mm of clearance from rock impact.

What’s the difference between a 170 and 175 cranks?

Currently, 170mm is considered ″short,″ 172.5mm is considered ″regular,″ and 175mm cranks are extremely popular. Although the difference between 170 mm and 175 mm is less than 3 percent, the leg lengths of bike riders vary by a factor of several times more than that percentage.

What size cranks do I need for mountain bike?


Height Crotch height Crank Length
Between 158.5 and 174 cm Between 74 and 80 cm 170
Between 172 and 183 cm Between 80 and 86 cm 172.5
Between 183 and 198 cm Between 86 and 93 cm 175
Over 198 cm Over 99 cm 177.5 – 180.0

Are longer crank arms better for climbing?

In order to determine crank length, saddle height, top tube length, or any of the other variables, there is no foolproof formula to follow. There are some broad rules of thumb, but there are many various complicating elements to consider, such as your predilection for climbing, which may make it more desirable to err on the side of a longer crank in some situations.

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What is the difference between 172.5 and 175 cranks?

There is just a 2.5mm variation in length between 172.5mm and 175mm. When the pedal is in the 6 o’clock position, we measure the height of our saddle. As a result, because your pedal is 2.5mm lower than it was previously, you should lower the seat by 2.5mm.

Does crank length affect gear inches?

The highest gear on a bike is higher for a particular set of chainrings and rear cogset combination.Similarly, the lowest gear on the cassette is a fraction of a turn lower.One of the problems we have today is that many triathletes appear to have forgotten about this’minor’ element — that crank length has an impact on gearing.Short cranks are all the rage right now, and for a variety of valid reasons.

Are shorter cranks better for knees?

Pain has been alleviated. The knee at maximum flexion is reduced by 7.5 millimeters just by inserting shorter crank arms and making no other changes to the machine. The relief provided by this disparity is roughly 3° to 4° in elevation.

Are shorter cranks better?

By switching to a shorter crank, you will be able to ride at a lower back angle, which will reduce frontal surface area, therefore increasing aerodynamics. Having the knowledge that there are a variety of crank alternatives available that might work for an athlete can be discouraging.

What is the correct crank length for me?

Measurement of the Leg Length

Crank Length(mm) Inseam(cm) Height, Male and Female*
162.5 77 Up to 166.3 cm Up to 5′ 5′
170 81 – 83.5 173 – 179 cm 5′ 8′ – 5′ 10½’
172.5 83.5 – 86 179 – 185.5 cm 5′ 10½’ – 6′ 1′
175 86 – 89.5 185.5 – 192 cm 6′ 1′ – 6′ 3½’
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Does MTB crank length matter?

In spite of the fact that shorter cranks provide somewhat higher gearing, shorter cranks accelerate more quickly through the top and bottom of the stroke than longer cranks do. There is no discernible reduction in maximum power when using shorter cranks. Dr. Dreyer is one of the most well-known and renowned researchers in the field of bicycle mechanics.

What crank length do the pros use?

Over the years, criteria for crank length have been widely acknowledged in the cycling community. Rider’s who measure less than 30 inches (76 cm) from their crotch to the floor are often sold 165- or 170-mm cranks, while riders who measure 30-33 inches (76-84 cm) are typically sold 172.5-mm cranks, and taller riders are typically sold 175-mm cranks.

Should taller riders use longer cranks?

People who are taller than 1.90 m (6’3′′) may want to explore cranks that are 180 mm or longer, although they are difficult to come by (such people’s bikes are likely to have been built with 175 mm cranks). Fortunately, riding with a crank that is shorter than suggested is unlikely to result in serious consequences for you.

How do I know what crankset to buy?

In general, cranks are available in a variety of sizes, with the most popular being 165mm to 190mm.The optimal crank length is frequently decided by three factors: the rider’s height, his or her cycling discipline, and the rider’s personal preferences.If you adjust the length of your cranks, it will affect how it feels to peddle your bike, as well as how well you fit on your bike, among other things.

Are shorter cranks better for hips?

A better run is made possible by less hip flexor strain. A shorter crank implies that you won’t have to elevate your leg as high with each rotation, which means that your hip flexors will be more rested when you start the run because the crank is shorter.

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