[blackspire]

I got a DT Swiss Hugi hub for disc brakes (it's a rear hub). I can't mount the disc for my Hayes brakes, whats wrong?

This is a picture of what happens:
http://img178.imageshack.us/img178/1767/img2230a.jpg

The disc wont fit properly on the hub?

 

[ultraNoob]

Can you post a pic with as much of the bolts installed as you can. Or a pic from the top. I've never seen that happen and I'm interested to see what exactly is going on.

 

[allsk8sno]

looks like its caught on the lip for the cone or whatever, try lifting it up and repositioning it so it's even? however that would cause the disc to warp when tightened...

 

[blackspire]

looks like its caught on the lip for the cone or whatever, try lifting it up and repositioning it so it's even? however that would cause the disc to warp when tightened...

Yes it's caught on the lip, if I tighten the bolts as it is now there will be very little contact with the hub so I don't think it's such a good idea.

Can you post a pic with as much of the bolts installed as you can. Or a pic from the top. I've never seen that happen and I'm interested to see what exactly is going on.

Hmm, I don't have anymore pics to post atm, but in short what's going on is the disc won't slip past that outer ring and lay on the hub. All the bolts could be installed but as I said above there will be very little contact then. It's a distance of maybe 1-2 mm between the disc and holes for the bolts (height wise, it fits with the bolt pattern).

 

[jonKranked]

Is it a new hub or an old hub? What about the rotor? I've seen on older disc hubs where there was a very snug fit, but never anything like this.

 

[ultraNoob]

Maybe a little dremel to rotor action is required. So long as you only grind off JUST ENOUGH of the rotor to clear the portion of the hub it's snagging on, you should be ok. Maybe practice with an old rotor.

^^Opinion from elder monkies for the above please.^^

 

[blackspire]

Is it a new hub or an old hub? What about the rotor? I've seen on older disc hubs where there was a very snug fit, but never anything like this.

It's an old hub, went to the bike store and there was a spacer for it. It fixed that problem but when I mounted it the rotor rubbed against the frame and I needed more spacers to fix that. Now the the only problem is rotor rubbing against the brake (cos it's not true). But I don't think I'll be able to fix that, I'll just get a new brake it's so old anyhow

 

[jonKranked]

It's an old hub, went to the bike store and there was a spacer for it. It fixed that problem but when I mounted it the rotor rubbed against the frame and I needed more spacers to fix that. Now the the only problem is rotor rubbing against the brake (cos it's not true). But I don't think I'll be able to fix that, I'll just get a new brake it's so old anyhow

A part of me wants to say that a new brake won't fix it (unless its a super old brake as well), and that the hub is more likely the cause.

Is this a 135 spaced hub? Do you know exactly how old it is?

 

[Quo Fan]

You can true a rotor. Done in the same manner as truing a wheel, only use an adjustable wrench instead of a spoke wrench.

I true mine using my TS-2 truing stand with a spoke bent and clamped to the upright arm. I use this as a "runout" gauge.

 

[jonKranked]

You can true a rotor. Done in the same manner as truing a wheel, only use an adjustable wrench instead of a spoke wrench.

I true mine using my TS-2 truing stand with a spoke bent and clamped to the upright arm. I use this as a "runout" gauge.

In my experience, doing this isn't really a long term fix. I've had rotors go right back to wobbly as soon as they heat back up from a run.

FWIW Park actually makes a rotor truing tool:

http://www.parktool.com/products/detail.asp?cat=14&item=DT-2

 

[ultraNoob]

hmmm, I wonder what would happen if I heat treat a rotor in my oven for 3hrs at 250deg and let it cool overnight?

 

[jonKranked]

hmmm, I wonder what would happen if I heat treat a rotor in my oven for 3hrs at 250deg and let it cool overnight?

No idea. But if you could figure out a way to get it a bit hotter AND put a lot of pressure on it, you could probably make it as good as new.

 

[Westy]

You'd end up with a warm rotor. 250 degrees isn't going to do squat.

 

[blackspire]

A part of me wants to say that a new brake won't fix it (unless its a super old brake as well), and that the hub is more likely the cause.

Is this a 135 spaced hub? Do you know exactly how old it is?

The brake is old too, you know those Hayes Purple brakes? It's one of those.

It's a 135mm, I got a Santa Cruz Bullit. I don't know exactly how old the hub is, but it looks like it's in good condition at least. My old hub, or rather entire rear wheel was a mess, a lot of play in that wheel.

 

[ultraNoob]

No idea. But if you could figure out a way to get it a bit hotter AND put a lot of pressure on it, you could probably make it as good as new.

You'd end up with a warm rotor. 250 degrees isn't going to do squat.

hmmm, you guys know those steel plates the power company puts over open trenches, I have one here at work. If I cut 2 1'x1' pieces and sandwich the rotor inbetween, then pop it in the oven and hit the self clean cycle (800deg) and let it cool slowly..... whuja think?

 

[w00dy]

I think you could make some killer paninis with that setup.

 

[jonKranked]

hmmm, you guys know those steel plates the power company puts over open trenches, I have one here at work. If I cut 2 1'x1' pieces and sandwich the rotor inbetween, then pop it in the oven and hit the self clean cycle (800deg) and let it cool slowly..... whuja think?

At work I have access to a heated plate press... I can get it up to around 600ºF and 10,000 PSI. Problem is it's only big enough to fit a 6" rotor. But there is talk of getting a larger one. Large enough to fit two 8" rotors