front wheel and disc brakes

[craigb]

ok i purchased my girlfriend a nrs2 a couple of months ago it has manitou blacks very nice fork i beleive and shimano hubs (you cant have everything). every time i remove the front wheel to transport it when i put the wheel back on the dics rubs so i re aligne the caliper luckily it has avid bb7s so its easy. why does it do this? has anyone else had this sort of problem? could it be the hub? i doubt its the forks as they are not exactly cheapo

[Dumbellina]

Its probably because the level is being depressed during transport, whether by accident or because there's stuff loaded on top of it.

If they were hydros you would have to remove the pads and push you pistons back, I use a plastic tyre lever.

Hey, bike industry people, someone told me that I shouldn't turn my bike upside down to do this. Is this true?

[grumpy rooster]

Are the disks slightly warped?

Also depending on how close you have your pads adjusted to the disk any slight change in angle when you put the wheel back on could make it enough to make the pads rub. Have you tried setting the gap slightly larger between the 2 to see if it still does it?

Mine rub a little when I first ride it but after a few brake applications it goes away.

[Grover]

craig, i'd put my money on it being the tension in the quick release lever.

i didn't realise that a slight difference in tension squeezed the dropouts together so much until i figured out that whenever i removed my wheel and replaced it the brakes would rub.

look at the pads, if the outside pad is the one rubbing then the tension of the skewer is more than when you initially setup the brakes and needs to be loosened, if the inside pad is rubbing you need to do the skewer up tighter.

oh, and dumbelina - bb7's are mechanical so it won't be anything to do with the lever being squeezed during transit and the pistons popping out. you are right about not putting your bike up side down though. it's a rare occurance but people have had experiences where air gets trapped in the caliper due to storing/transporting their bike this way resulting in very crappy brakes.

[craigb]

hmmm. why have none of my bikes done this ive owned an xtc1 rockshox and my salsa with fox and i transport my bikes all the time and have never had the problem. also ive tried backing the quick release off no difference and tightening it still no difference. its doing my head in

[craign]

I have an XTC2, Manitou Skarebs, Hayes HFX9's and have this problem. Its definatelty nothing to do with the lever getting depressed iny my case. Its purely the disc and caliper alignment being slightly different after putting the wheel back on.

Maybe I'll try and be more carefuly with consistent QR tension?

[solo]

hey mate hope this helps you

if your disc rotor is not warped then here is an easy way to set up discs mechanical or hydraulic works for both types

simply undo the two bolts that bolt the brake caliper to the adaptor on your frame (these are the two that allow the whole caliper to move it sideways)
then when they are loose hold the lever so the pads grab the rotor and retighten the two bolts
this will centre your calier over the rotor

if your rotor is rubbing because of warp you can bend it back by hand till its straight again very easy but do it carefully dont wrench on it


if you have hyraulic discs an they still rub then your pistons may be stuck out of position you will have to remove your brake pads and push the pistons back in with a small screwdriver clean around them(the piston) reattach pads


hope this helps you
works for my nrs 2 that i ride

[craigb]

thats the thing i can setup my brakes no worries its just no matter what i do the bloody wheel never ever sits the same next time i put it in so re-aligne the calliper we ride all is good next time the wheel comes out for transport we have to do it all over again. glad to know im not alone on this

[barefootbushman]

I have had this problem to, and I have found out that when you tighten the quick release, the forks are squashed in about a millimeter, if that. So if you don't put your wheel back on with the same amount of presure as before, the disc rotor will be in a different position and might rub. Some forks may be stiffer and may not have this problem, I dunno. I also only ever have this problem on the front wheel.

[craign]

Yup, front wheel only too!

[meonme]

Ive had a very similar problem on my bike.

If the brakes are set up fine for your ride its all good but then when you take the wheel off and put it back again everything is off.

For me my problem was i wasnt putting the wheel back in the exact same alignment as it was when everything was all good. So what i do now to get it back in the same place is to line up the middle of the tread with a sticker that is on the middle of the fork.

I usually tighten my qr enough so i know if i push it all the way the wheel is locked in. Then I back it off half way so i am still able to move the wheel left or right but with a bit of pressure, and using my thumb to line up the sticker and tread. Once this is locked off its in the exact same position as before with no brake rub.

Hope this helps :p

[Laika]

ok i purchased my girlfriend a nrs2 a couple of months ago it has manitou blacks very nice fork i beleive and shimano hubs (you cant have everything). every time i remove the front wheel to transport it when i put the wheel back on the dics rubs so i re aligne the caliper luckily it has avid bb7s so its easy. why does it do this? has anyone else had this sort of problem? could it be the hub? i doubt its the forks as they are not exactly cheapo


My vote goes for QR tension. I have a Giant VT with Manitou Black, Avid Mech, Deore hubs and I also have to drop the wheels to transport my bike. I've found changes in the QR tension can cause the problem your having. I found if you spend a extra few seconds getting a constant QR tension the rub is minimal, maybe a couple of click of adjustment at most and sometimes none at all.

[craigb]

talked to a couple of very good bike mechanics and ive been informed it will more than likely be the hubs causing this problem and if not rectified (replace the hub with something decent) it may end up stuffing the fork lowers! i will be geting a new front wheel built up tomorow and will keep you posted on how we go. ive had a feeling this was what was causing the problem.

[craigb]

ok i said id keep you guys posted and i am. got a new set of wheels built with white industries hubs (yeah yeah i know not many people use them but they are great hubs) and so far so good threw the bike on the roofrack last night get to my girlfriends place put the front wheel in and no dramas atall so im puting it down to cheap s#*t shimano hubs. you lern something new every day and this maybe it