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Should gravel bike and mtb have longer crank than road bike?

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Should gravel bike and mtb have longer crank than road bike?

Old 05-01-19, 01:01 AM
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Obeast
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Should gravel bike and mtb have longer crank than road bike?

I have a little dilemma as I go about building my gravel bike, which is a mtb frame converting to drop bars. The current crank on it is 5 mm longer than the ones on my road bikes. Since this gravel build will be on paved roads 95% of the time, will I be less effective as a cyclist on longer commute rides? I do about 20 miles round trip to school.
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Old 05-01-19, 01:46 AM
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I'd say crank length is entirely a matter of preference and makes little, if any, difference to your effectiveness as a cyclist. Using shorter cranks tends to encourage a higher cadence which negates any loss of power through having less leverage. I once changed the cranks on a bike to 155mm and I can tell you it made no noticeable difference to my overall effectiveness. You need to adjust your saddle height and you may also need to adjust the gearing to compensate.
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Old 05-01-19, 02:27 AM
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late 80ies i'd guess.

edit: sorry wrong thread i guess.
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Old 05-01-19, 02:33 AM
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For converting a mtb to drop bar you will need to raise the stem about 5cm and then get about a 5cm shorter stem. i did this in 2008 for the first time. I have lots of experience doing these conversions. I also did road discs back then (when it did not exist pretty much), road levers, bb7 road, adapted mtb shifters. done.

you will become less "effective" with a drop bar mtb compared to a road bike i can tell you that. about 2-3 minutes slower per 30minutes for the same input.
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Old 05-01-19, 06:11 AM
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It was once considered normal to have longer cranks on Mtn bikes than Road bikes (perhaps it still is), due to wanting torque for climbing although I don't believe that it really makes much difference. Mtn bikes normally have more upright riding position however which makes longer cranks more manageable. If you intend to adopt a lower riding position with drop bars then the longer cranks will rise higher into you chest when using the drops. With drop bars your normal road bike crank length is more advisable.
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Old 05-01-19, 06:15 AM
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Originally Posted by carlos danger View Post
late 80ies i'd guess.

edit: sorry wrong thread i guess.
You musty have meant to post that in the Schwalbe thread.
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Old 05-01-19, 06:48 AM
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Carbon cranks. With holes. More lighter.
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Old 05-01-19, 07:30 AM
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Longer cranks require more flexibility to get lower / more aero, but they also give a bit more leverage to create power when cadence drops. on really steep grades when you are out of gears and grinding away at very low cadence on gravel, the longer crank can help you stay in the saddle to prevent the rear tire breaking loose. Since people generally aren't worried about getting aero on a gravel bike or MTB, I can see longer being an advantage. If you live where it's flat and lots of wind with limited flexibility the shorter crank might make sense on gravel when fighting a headwind.
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Old 05-01-19, 08:58 AM
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Old 05-01-19, 10:30 AM
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Originally Posted by carlos danger View Post
For converting a mtb to drop bar you will need to raise the stem about 5cm and then get about a 5cm shorter stem. i did this in 2008 for the first time. I have lots of experience doing these conversions. I also did road discs back then (when it did not exist pretty much), road levers, bb7 road, adapted mtb shifters. done.

you will become less "effective" with a drop bar mtb compared to a road bike i can tell you that. about 2-3 minutes slower per 30minutes for the same input.
I could have sworn that the OP asked about crank length.
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Old 05-01-19, 10:49 AM
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Originally Posted by sputniky View Post
I could have sworn that the OP asked about.....
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