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V-brake mounting adaptors?

901 Views 8 Replies 5 Participants Last post by Cyco-Dude, Jul 14, 2007

ninja>pirate

Discussion Starter · Jul 13, 2007 (Edited)

I just got a new bike and I don't like the cheap front disk brake (tektro) so I want to put on some V-brakes (avid SD-7). The bike is an older Schwinn Homegrown but has a 2006 Marzocchi Grand Fondo 3 fork on it.
The problem I ran into is that the brake bosses aren't the same as on my last bike. There are threaded holes in the fork at the right place but shouldn't there be pieces that stick out with a threaded hole and a little hole on the inside? Is there an adapter I can get?

Oh yeah, also a second question... my rear wheel seems to be unbalanced. When I had the bike upside down pedaling through the gears when it got going really fast the whole bike would go vibrate up and down. When I test the roundness of the wheel and tire it doesn't seem to be perfectly round and one section of the tire seems to be heavier than the rest. Any advice on fixing the wheel? I have trued wheels before, but I've never ran into this.

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Cyco-Dude

· #2 · Jul 13, 2007

you need brake bosses; they are the part that screws into the fork that the v-brakes ride on.

as for the wheel, is it tubeless? did you take the tire off and look at it? if the wheel is round, just get a new tire.

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ninja>pirate

Discussion Starter · #3 · Jul 13, 2007

I took off the tire, it's definitely the rim that's not circular. It still does the same thing with the tire off. Can I get my LBS to fix that or is the rim done for?
That's good about the brake bosses, I should be able to get those for cheap.

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nachomc

· #4 · Jul 13, 2007

How much will you spend on switching to v-brakes? You can get Avid BB5 for $60/wheel and even less if you catch a year-end sale.

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ninja>pirate

Discussion Starter · #5 · Jul 13, 2007

I got the V-brakes for <$50 CND and I've heard bad things about the BB5s. Plus I just don't think I need disc brakes, none of the guys around here run them.

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snaky69

· #6 · Jul 13, 2007

BB5 and BB7 brakes are awesome, whoever told you bad things about them didn't know about setting them up correctly.

Remember, it's not because nobody runs them around you that they're crap. I love my disc brake on my street rig(seen in my profile) and I just wouldn't run anything else.

You can order brake bosses directly from Marzocchi(your fork manufacturer), or your LBS should be able to order them for you easily.

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jeffj

· #7 · Jul 13, 2007

I would get the brake bosses from the fork manufacturer if possible. Some use different threads than others and they are 'stiff' when you thread them in. You want to make sure you have the correct ones or you could bugger up the fork.

That said, I would get a BB5 disc brake over a v-brake. You can find them for $38.30 here:

http://cgi.ebay.com/Avid-07-BB5-160...ryZ58082QQrdZ1QQssPageNameZWD1VQQcmdZViewItem

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nachomc

· #8 · Jul 13, 2007

ninja>pirate said:
I got the V-brakes for <$50 CND and I've heard bad things about the BB5s. Plus I just don't think I need disc brakes, none of the guys around here run them.

Ah ok. For what it's worth, I had BB5s for a little over a year before buying a new bike with Juicy 5's. I never had any issues with my BB5s.

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Cyco-Dude

· #9 · Jul 14, 2007

ninja>pirate said:
Can I get my LBS to fix that or is the rim done for?

yea, take it to the lbs and see if they can true it up for you. as long as the rim itself isn't messed up, they should be able to get it round no problem.

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