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Has this been done? ( disc brake content )
Hi all,
This may be a stupid question and maybe an obvious answer that I’m not seeing, but I will ask it anyway...and flame away!!! On a rim brake bike, what would be the ramifications of replacing the fork, brake caliper and left shifter to a hydro disc brake set up and leaving the rear brake as a rim brake? As always, thank you all in advance! Steve
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Livin’ the dream ( just like Mike ) |
#2
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Sure lots of bikes are set up this way. As long as the fork is specced the same in length and similar rake there is no changes other than the braking which i assume you will prefer since looking to change it to disc.
Obviously you will need at least 1 new extra front wheel as well but other than that.. |
#3
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Thoughts?
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Livin’ the dream ( just like Mike ) |
#4
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Disc wheels are subjected to brake forces bit differently than rim braked wheels. so 20h front hub even if you can find one is likely to be to weak (at least for my taste). Id rather have a 28h or even 32h for disc wheels but yeah some of the disc braked wheels do have 24h spokes these days.
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#5
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Greg |
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Steve, I did this to a mid-90s Trek 750 (aka 520) CrMo frame, replacing the stock tubular steel fork with a Nashbar carbon disk / canti fork, set up with a mechanical disk brake.
The bike isn't used much but it has worked well so far. |
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Anyone know of an 1 1/8th straight fork, 43 rake that is 100 x 12 thru axle?Seems the world has moved on from 1 1/8 disc forks and are now all 1 1/4 or tapered.
Thoughts??? Thank you! S
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Livin’ the dream ( just like Mike ) |
#9
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They are mostly 1 1/8th tapered to 1 1/4 or 1 1/2 now. Straight with thru axle is a rare bird, but somebody must have made them. For a Mullet application, A straight steering tube qr fork would be fine.
Last edited by pbarry; 09-15-2019 at 07:45 PM. |
#10
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Ritchey sells one, or find a used wound up.
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#11
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The Ritchey gravel fork has a 380mm axle-crown measurement. This would be 8-13mm longer than a typical road fork. If the OP is planning this experiment for an existing road bike, the Ritchey fork would have an impact on the frameset geometry.
Greg |
#12
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True, I didnt think about the A-C height. Thats going to be a tall order finding a road fork with disc, thru axle and a 1-1/8" steerer. Maybe ritchey will sell you one when the new road logic disc starts shipping.
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You don't need a complex analysis to know this, you just need to look at the locations that the forces get transferred into and out of the fork/wheel. Forces are transmitted to the wheel/fork from ground at the bottom of the wheel; forces are transmitted from the wheel/fork to the frame at the headset bearings. For the same force applied by the ground to the bottom of the wheel, the same forces will be transmitted to the frame at the headset bearings. What's going on between them won't change the forces transmitted from ground to frame. |
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What you are suggesting has often been done on MTBs and 'cross bikes, and is sometimes referred to as a 'mullet'. As long as the fork has the same dimensions (length,offset), there shouldn't be a problem. Well, other than trying to get the two brake levers to match each other enough that it doesn't feel weird to ride it.
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#15
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I think you're looking at a new wheel for this project. |
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