Disc Brake Conversion
I have a roughly 7 year old Motebecane Fantom CX Ti cyclocross bike that came with canti-lever brakes but had disc hubs and disc mounts as part of the build. I've been interested in getting a new wheelset and am wondering about just converting to disc brakes because that seems -- well -- inevitable.
It appears the frame and fork are pretty traditional 100 mm and 130mm spacing with QR. The bike also has 10 sp Rival. The hubs appear to have a 6 bolt pattern. Are there any disc brake sets that would work? (and yes, not converting is also an option). Thanks! |
TRP Spyre
SRAM BB7 (road version) Juin Tech R1 Yokozuna Hayes CX Shimano BR-CX77 basically, any mechanical disc brake caliper designed for short-pull (road) levers will work. be sure you have the correct caliper adapters for your frame/fork and rotor size, and the rotors you want. sometimes those are sold separately because there are several permutations for fitting the caliper to the frame and different rotor sizes. |
The 130mm spacing is traditional for road rim brakes, but was a very short-lived standard for road disc. Road disc quickly migrated to 135mm spacing, even before thru axle started taking hold.
I expect that you will have a hard time finding a selection of 130mm disc hubs. If you want to run multiple wheel sets, I would make sure that hubs are available before completing the conversion. |
since your bike has disc hubs and disc mounts already, itll be pretty cheap to convert. Just get some disc calipers, rotors, and new cables.
trp spyre are good quality mechanical brakes. juintech are good quality hydraulic mechanical. these are 2 that ive used in the past so i know about them specifically. whatever you buy, purchase some compressionless brake housing. specifically compressionless. it reduces the compression(obviously) that is inherent in spiral brake housing. |
Originally Posted by aggiegrads
(Post 21855168)
The 130mm spacing is traditional for road rim brakes, but was a very short-lived standard for road disc. Road disc quickly migrated to 135mm spacing, even before thru axle started taking hold.
I expect that you will have a hard time finding a selection of 130mm disc hubs. If you want to run multiple wheel sets, I would make sure that hubs are available before completing the conversion. |
Hydraulics are great.
However, in my limited experience, mechanical discs don't work noticably better than a good set of Canti brakes. Especially with salmon pads. And almost no futzing around. For me, hydro disc are worth it. Mechanical is too finicky and don't offer any real improvement over rim. |
The TRP Spyre, TRP Hy/RD and Avid BB& are great options for cable actuated brakes and will be an improvement over the rim brakes, especially when things are wet.
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Originally Posted by rosefarts
(Post 21855770)
Hydraulics are great.
However, in my limited experience, mechanical discs don't work noticably better than a good set of Canti brakes. Especially with salmon pads. And almost no futzing around. For me, hydro disc are worth it. Mechanical is too finicky and don't offer any real improvement over rim. I'm running a set of BB7's with full length compressionless housing though; they stop the same as my other bikes with hydros and the lever is just as smooth. Plus being able to adjust the pad spacing beats the long dead travel on hydros. |
you are going to spend alot of money for a sidegrade, unless you want to run carbon rims everyday, then disc conversion might be worth it on the long run
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you are not converting you are just installing discs if your frame can mount them but mech discs are terrible , hydros are only worth it because they give you full control over your brakes to lock , you can try to get a fork swap , you still wont get the benefit of through axles with a conversion, better to just upgrade the frame now instead of putting money into an old frame , you wont get much return over time ?!
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Are you sure about the spacing? Is this an aluminum frame? If steel, then just re-space it. Even an aluminum frame might fit a 135 hub without being bent. A year ago I would agree with people that this change doesn't necessarily make sense, but right now good rim brake rims are a pain to get. You definitely have to get lucky to buy one that will run tubeless.
I'm fairly happy with BB7 mechanical discs. I am not sure what better braking would really do for me since I can stop as quickly as I want with the bb7. I even have some bb5 on my fatbike and those seem to work just fine. OTOH, I'm sure I don't push my brakes as hard as some other people do. |
Originally Posted by dwmckee
(Post 21855840)
The TRP Spyre, TRP Hy/RD and Avid BB& are great options for cable actuated brakes and will be an improvement over the rim brakes, especially when things are wet.
|
BB7 calipers are going to run you around $120, discs will be another $50. I don't know that mechanical discs will really perform any better than a properly set-up cantilever set will, but if you ride in lots of wet/muddy conditions (like CX racing) it might be worth it. I would definitely try this out before buying new disc-hub wheels. Disc hubs with QR/130mm spacing are an oddity these days. If you stick with rim brakes, you will have a lot more options for new wheels.
I've also gone down the road of trying out mini-v's. I had the TRP CX9's for a few years on my old CX bike. They're really powerful, but the modulation is terrible, the levers feel really mushy, and the pads have to be run super close to the rims so they do not work well in mud and were constantly rubbing. I eventually replaced them with a set of Avid Shorty Ultimates, which have been (by far) the best cantilever brakes I've ever used. |
Originally Posted by Stickney
(Post 21855132)
I have a roughly 7 year old Motebecane Fantom CX Ti cyclocross bike...
The bike also has 10 sp Rival. |
Originally Posted by msu2001la
(Post 21863324)
Disc hubs with QR/130mm spacing are an oddity these days. If you stick with rim brakes, you will have a lot more options for new wheels.
|
Originally Posted by Stickney
(Post 21864332)
Thanks for all the replies -- indeed the 130mm rear spacing appears to be the big issue. I suspect I could squeeze 135mm in the frame, but ultimately the rim brakes work well enough and I'm going to stick with them.
Dave |
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