Chinese Carbon MTB > 26er & 27.5 (650b)
John's 26er Build for the Kiddo
Carbon_Dude:
From the looks of the hole sizes, your front derailleur cable w/o housing would exit from the small hole in the bottom bracket, then you would run the cable with housing behind the bottom bracket into the larger hole and up to the front derailleur.
cmh:
--- Quote from: Carbon_Dude on January 20, 2016, 11:06:17 AM ---From the looks of the hole sizes, your front derailleur cable w/o housing would exit from the small hole in the bottom bracket, then you would run the cable with housing behind the bottom bracket into the larger hole and up to the front derailleur.
--- End quote ---
Not sure I agree with that. If the cable exits one of the two small holes and runs around the bottom bracket shell and up through the single larger hole behind the BB, the cable would be running over the paint, and that's no good. The question I'd ask is if there's a stop in the bigger hole, and if so, I'd think that both cables are expected to exit at the two smaller holes, immediately go into housing, and the FD housing goes into the bigger hole, where the RD housing would go back to the RD, fastened down to the provided guides on the DS chainstay. There's no provision for an under-the-BB guide like jwilds1 refers to, so I'm guessing that's not part of the design, and probably wouldn't work well if he tried to use one due to the large radius under the BB. If housings are expected to go right up against those two smaller holes, I would have thought there would be some provision for aligning them - but this is all guessing on my part.
jwilds1:
Thanks. It definitely is a little confusing. The entry point at the headset looks as if it's sized to allow cable housing to be routed the entire length, but then you look at the two holes on the downtube and they definitely don't look sized that way. I wouldn't have an issue with drilling them out a little, but would rather get closer to being 100% sure that it's the right thing to do.
I have seen a lot of FS bikes that route this way, with a small gap between the BB and cable.
I'll take care of the rear brake tonight and try and do some more investigating.
MTB2223:
Can you show us a picture of the exit hole of the front derailleur cable at the back of seat tube?
Carbon_Dude:
--- Quote from: jwilds1 on January 20, 2016, 01:44:19 PM ---Thanks. It definitely is a little confusing. The entry point at the headset looks as if it's sized to allow cable housing to be routed the entire length, but then you look at the two holes on the downtube and they definitely don't look sized that way. I wouldn't have an issue with drilling them out a little, but would rather get closer to being 100% sure that it's the right thing to do.
I have seen a lot of FS bikes that route this way, with a small gap between the BB and cable.
I'll take care of the rear brake tonight and try and do some more investigating.
--- End quote ---
I agree, I must not have explained it well in my earlier post but I was thinking the same as you. That is how my -036 full suspension frame would be routed if I had a front derailleur. Does seem a little odd that a hardtail would be routed that way though.
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