[opticals]

hello all.
when I'm setting up Mono mini on the repair stand, it's rub free.
But when i'm sitting on the bike (ti Hardtail) I can hear it rubbing.
I've sat down and ask a friend to see the brake and the pad are actually rubbing the inner rotor?
Is this normal?
Should I set up the rear brake while sitting on the bike or?
Please advise.

Thanks..

 

[flipnidaho]

flexy seatstays

The seatstays where the caliper is attached is probably flexy enough to bow out when it's weighted. The carbon stays on my Fuel does the same thing. I typically play with it a little to get it rub free on the stand and while riding. However, given a choice, I'd live with rub on the stand and no rub while riding...

 

[XSL_WiLL]

I'd attribute it to flex within the frame. Titanium frames lack the rigidity that aluminum has to offer. But titanium has awesome dampening characteristics. You may just need to slip in some spacers.

 

[opticals]

I wonder it's the Ti chainstay that flex or my CrossMax?

 

[Lizard biker]

simple solution (maybe)

I had this problem last week with my Hayes and the solution was simple (not sure if it the same for you but feel free to try).

I had spent a lot of messing about and wondering why my front wheel only rubbed when I was sitting and riding it and not when I just spinned it by hand. I took my wheel off and re-set the bolts that hold the wheel on the fork so that they were pretty much centred. (they were very uneven) This therefore centred the wheel, and hence the brakes, when I tightened the release lever.

I fugured this happened because I had been taking my front wheel on and off a lot in the last while in order to transport my bike, and the tightening bolts / quick release mechanism had been moved.
...I also guess that having the rotor centred allows for the flex that happens.

 

[opticals]

I had this problem last week with my Hayes and the solution was simple (not sure if it the same for you but feel free to try).

I had spent a lot of messing about and wondering why my front wheel only rubbed when I was sitting and riding it and not when I just spinned it by hand. I took my wheel off and re-set the bolts that hold the wheel on the fork so that they were pretty much centred. (they were very uneven) This therefore centred the wheel, and hence the brakes, when I tightened the release lever.

I fugured this happened because I had been taking my front wheel on and off a lot in the last while in order to transport my bike, and the tightening bolts / quick release mechanism had been moved.
...I also guess that having the rotor centred allows for the flex that happens.

Can't really adjust on the CrossMax.
It's screw in from both side so the axle lenght should be even.

If I can live with rub on the repair stand, how can check how true my rotor are?
Will replacement the Mavic Skewer change the situation?

 

[Rainman]

Why don't you try setting the caliper up with someone about your weight sitting on the bike???

That *may* solve it for you.


R.

 

[opticals]

It's the crossmax

I've check my friend crossmax and yes, his does the same too.
Can anyone see if their crossmax Disc flex inward while sitting on the bike?

 

[Soupboy]

It's odd that your hub/axle would flex enough to cause this. That concerns me more than the frame which has a bit of pliability being Ti and all. Are your axle ends or cones snug on the Crossmax?

Even if it's the frame that is flexing it should only be doing so vertically. Not sure what would cause it to flex inwards.

Also, try a quality QR - XT, Hope, etc. The Mavic QRs are junk IMO.

 

[opticals]

It's odd that your hub/axle would flex enough to cause this. That concerns me more than the frame which has a bit of pliability being Ti and all. Are your axle ends or cones snug on the Crossmax?

Even if it's the frame that is flexing it should only be doing so vertically. Not sure what would cause it to flex inwards.

Also, try a quality QR - XT, Hope, etc. The Mavic QRs are junk IMO.

Tried with a XT QR too.
My old xt with 717 don't flex a bit.
Maybe it's time to sell my Crossmax and go for the king!

 

[Lumbee1]

I had the same problem with my GF Cake. Carbon seatstays and cheap wheels. Turning in the corners or leaning the bike made it much worse. I solved the problem by getting rid of it and buying a Spec Stumpjumper.

 

[endurowanker]

I wonder it's the Ti chainstay that flex or my CrossMax?

probably the chainstays. your hub would have to flex for the wheels to be an issue, and hubs are pretty rigid.

check your hub bearings though, you might be on to something.

 

[Unknownrash]

I had the same prob with my bike. I tried Salsa skewers, XT, Speedcifics, and trying really crank them down. What fixed the problem for me was using Hope skewers. They seem to really be stiff and and clamped the wheel so it wouldn't shift around in the dropouts.