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Question to the hive mind.
I've currently a nice pair of farsports 38mm carbon rims with non disk bitex hubs. They are great and only get used in good weather.
Could I swap the rims onto some disk hubs and be ok, or would it not work cos of the different forces at play through the spokes?
Thanks
Should be fine I think? Caveat that unless the rims are "5D" drilled*, in which case you have to match the lacing pattern as well which means no swapping from radial to 3x.
*other marketing buzz phrases exist for describing the same thing, essentially the rims are drilled angled front/back as well as left/right so they point towards the hub flange better.
Almost certainly fine tbh, but have you asked farsports? In theory a rim can be engineered for v or disc exclusively but in practice it's not often going to be the case. Especially if the spoke count's reasonably high
I've not asked farsports, but that's a good shout. I don't think there's any special drilling and they were also targeted at cyclo-cross so hopefully ok.
I'd say you want a minimum of 24 holes in the rims - disk wheels have to transfer braking torque through the spokes. Often rim brake front wheels have 20 holes - not only too few (depending on your weight really, ie how much force is needed to slow you down...), also as a result there's a lack of disk hubs with < 24 holes.
I’d say you want a minimum of 24 holes in the rims – disk wheels have to transfer braking torque through the spokes. Often rim brake front wheels have 20 holes – not only too few (depending on your weight really, ie how much force is needed to slow you down…), also as a result there’s a lack of disk hubs with < 24 holes.
I was trying to figure this out in my head, I actually think the radial loads are higher in a rim brake wheel because you have a the hub pushing one way and the rim the the other way? The disk hub adds a torsion to that but it's loaded around the whole wheel not just the rear spokes.
The reason you don't get many 20h disk hubs is disk wheels need to be crossed spokes. Crossing spokes at an extreme angle means they end up exiting the hub flange almost tangentially meaning they hit the spoke behind in extreme cases. And for the same number of crosses, larger flanges mean more chance of clashes. 24h 2x is the same angle as 36h 3x so 20-24h is the practical lower limit for even a lightweight disk wheel.
thisisnotaspoon
Full MemberI was trying to figure this out in my head, I actually think the radial loads are higher in a rim brake wheel because you have a the hub pushing one way and the rim the the other way?
Question is what's higher, braking force or pedalling force. Disc brakes put all the force through the spokes, rim brakes apply force direct to the rim. Albeit the wrong side of the rim.