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Should my fit across stable of bikes be the same?
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I have 4 bikes:
Canyon Endurace Road
Orro Terra C Gravel
Ridley Dean RS TT bike
Canyon Exceed MTB hardtail
They are all size large and have 175mm cracks except the Orro which is XL and 172.5mm.
Just for reference I am 188cm tall and 89cm inside leg.

I have been thinking about changing the TT bike to 170mm cranks given all the talk about the advantages of shorter cranks, especially on TT bikes. But when I told a friend my plan he was shocked and suggested that I would have to have the same length on all my bikes or I would risk problems with injury/pain in some muscle group or joint. He is a roadie with only two road bikes, and they have been set up with identical seatposts, saddles, stems and cranks.

This got me thinking about the fact that we all have different bikes for different jobs and the geometry of each is designed to make it more comfortable/efficient to do that job.
The gravel bike would have a higher front and more upright riding position and the long saddle be quite a bit behind the BB, whilst the TT bike would be lower at the front and the shorter saddle closer to the BB. The MTB has very much wider bars. The weight distribution is also be very different.

All these differences in geometry and weight distribution make it impossible to have the same stack and reach etc. for every bike. I am quite adaptable to different bikes and not sensitive to small changes, (raising the saddle by 5mm would probably go unnoticed), so I move between them without much issue.

So what is best/standard practice for setting up each bike?
If I went to a fitter and had a fit for each bike individually would there be transferable measurements that could/should be applied to all, apart from saddle height, which I suspect would be the same for all.
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Re: Should my fit across stable of bikes be the same? [paulfrost] [ In reply to ]
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Simple.

Each bike has a different fit.

By the way, you might want to try 155mm cranks on your TT bike.
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Re: Should my fit across stable of bikes be the same? [paulfrost] [ In reply to ]
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paulfrost wrote:
But when I told a friend my plan he was shocked and suggested that I would have to have the same length on all my bikes or I would risk problems with injury/pain in some muscle group or joint.
That's like saying that an athlete who runs should never attempt to go for a walk, because the difference in stride will destroy their legs.

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apart from saddle height, which I suspect would be the same for all.
Depends on how you mean "saddle height." Cyclists usually have a pretty narrow range of leg extension that they prefer. If you switch to a shorter crank, for example, you'll typically need to raise the saddle slightly in order to maintain similar leg extension at the bottom of the pedal stroke. Moving the saddle forward or backwards will similarly change how your legs reach the cranks, and can require changing the saddle height.

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All these differences in geometry and weight distribution make it impossible to have the same stack and reach etc. for every bike.
Yes.
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Re: Should my fit across stable of bikes be the same? [paulfrost] [ In reply to ]
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My garage has a range of bikes from a folding Brompton, through a hardtail, couple of full sussers, andnout to a road bike and a TT bike.

I'm sure I'd not be able to replicate my TT bike position on the Brompton.

And certainly wouldn't stay out of the hospital emergency dept for very long if I set up a downhill mtb to put me in the same position as on the TT bike either !

Every one different. Horses for courses.
Only similarity? I've a Cobb Max saddle on both road bike and trail full susser mtb.


Where I am some of the fitters offer to do a 2nd bike at less £££ than the 1st if done at same time (as they'll have assessed stuff like cleat position, imbalances / injuries etc for the 1st so don't have to double up. 2 bikes something like 1.4 or 1.5x the cost of 1 bike fit.
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