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Ergonomics - road cycling on mountain bike

Bicycles Asked by thetrueankev on August 5, 2021

I am new to cycling and have recently started to bike to work.

The distance is about 20 kms each way and I find that by the end of it my lower back starts to hurt.

I do work at a desk job and I probably do already have a bad sitting posture; which I’m trying to correct.

I was wondering what is the proper posture to ride on a mountain bike comfortably for about 1 hour ride. Or if this lower back pain is due to my back simply not being strong enough to lift my upper body as I’m sitting on the bike.

I’m looking for rule of thumb tips such as your seat should be high enough so that your leg is just reaching the pedal at a full extension.

Thanks!!

2 Answers

If you're rocking your hips while pedalling then your saddle is too high relative to the pedals, for your leg length.

Raise your saddle until you do start rocking while riding, and then lower it a couple cm or an inch.

If you now can't reach the road with your foot when stopped, then you will need to lean the bike, or get off the saddle at a red light.

This is not specific to MTB, but having a saddle that high might make MTB riding less controllable. If you ride off road, lower your saddle again by a bit. Draw two lines on the seatpost to help find your heights when adjusting.

Answered by Criggie on August 5, 2021

It is not only position/posture on the bike that can cause lower back pain.

The core muscles create the foundation for generating power on the bike, and when these are not up to the job they can get sore quite quickly.

This can often happen when trying to push a large gear at low cadences (common for beginners and less fit riders on steep hills). Even for an experienced cyclist on a well fitting bike, a long day out in the hills can leave the lower back feeling just as tired as the legs.

Answered by Andy P on August 5, 2021

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