Shaving rims to fit new brakes?

[lostinflyz]

Can anyone think of a reason not to machine down the central hub of my rim to fit a new set of brakes.

Fitting a new front end on the bike and the caliper spacing is about 1.5mm closer together than the previous setup. So figure ill take .75mm or so off either side. any probs??? The brake discs fit the new calipers but are within prob .1mm of the outside of the caliper body.

nothing major but dont wanna go buggering a rim if one does not have to.

if no issues can anyone think of best dudes in ChCH to do it???

[imdying]

The TL guys do it all the time when fitting TL front rims. Try Beaumont Engineering.

[Kickaha]

Beaumont did very good work but there used to be a big wait

Royce Clive have done it for me and Thorpe engineering would be the other one

[lostinflyz]

primo thanks guys, will check in with them monday.

is it beaumont or thorpe that also can do wheel straightening??

[Kickaha]

Thorpe definitely can

[imdying]

Royce Clive have done it for me and Thorpe engineering would be the other oneYeah, would happily recommend either of them too.

[FROSTY]

MY mental imagery has gone screwey here mate. sorry.
You are talking about .75 of a mm per side.
Thats SFA. The caliper slides/pistons should easily take up that amount of difference.
Only time I see it being an issue is if you fit cheap aftermarket pads that are overthick.
Again sorry but maybee its my mental imaging thingee

[lostinflyz]

on the radial gsxr calipers ive fitted the left brake disc is nigh on running against the caliper body. add in fork flex and it will rub on the caliper body which is bad.

taking out .75mm either side (prob just do 1mm for ease sakes) would pull the discs away from the very edge of the caliper body. As it is any flex will cause the disc to rub on the body and poentially lock or wear the disc wierdly.

and im not keen to find out wat might happen if the discs lock at the end of the ruapuna straight :shit::shit::shit:

ive been surprised during this whole process just how tight some of the clearnaces are down around the front end and specifically brakes. there isn't alot of room especially on the newer stuff

[FROSTY]

SNAP --gotcha.
Given you havent shunted the whole plot sideways by missmatching axle,bearing spacing etc. (yea I did it with a gixxer thou front end)
Then I'd suggest you work out EXACTLY how much to shave off the hub to have the disks centered in the calipers. The only potential issue I could see is if the disk mouunting bolt holes are blind and the bolts bottom out-prety unlikely though.

[lostinflyz]

yea. ive got the wheel inexactly the same position as previous wheel so im assuming that was primo. it has the same offset on both calipers so should be pretty good.

had a mate suggest about the bolts bottoming out but turns out the holes are straight through the entire wheel. so no probs there. and its not enough material removal to really worry about the amount of thread section left to hold the bolt on

the sizing issue is one trading off taking more off the rim or having them slightly off centre through the caliper (about .5mm). Figure being slightly off centre is better than taking more off the wheel. The only thing scary(er) than brake failure is complete wheel failure i think.

Well ill try this out and see what happens. only hope i can sort it before next weekend. of else ill have to swap in the old rgv front end. NNNOOOOOO!!!!

[FROSTY]

Mate--Make em center in the caliper itll cost ya fark all more BUT when ya fit new pads youll be a happy man.

[imdying]

Yes, take the time to get them right... if a job is worth doing...

[lostinflyz]

can make them centre in the caliper but would be taking quite alot of material outta the rim centre. will talk it over with the engineers and see what they say.

either way itll be pretty close to centre. There fairly new calipers so pistons move freely in and out really nice so fitting new pads no problem.

[Kickaha]

can make them centre in the caliper but would be taking quite alot of material outta the rim centre. will talk it over with the engineers and see what they say.

Rather than take it out of the rim can you not space the caliper out?

[lostinflyz]

trying to think of a way but being radial calipers the force is transfered through the bolt and leg base so i cant really think of a way of doing it.

any ideas more than welcome??

[Kickaha]

trying to think of a way but being radial calipers the force is transfered through the bolt and leg base so i cant really think of a way of doing it.

any ideas more than welcome??

Sorry I missed the bit about them being radial calipers, you're fucked then :shifty:

Is the distance with then bolted up the same from the disc centre to each side of the caliper body? you can't put a spacer between the caliper halves?

[lostinflyz]

yea the distance between each side is the same.

you need to pull the inside wall of the caliper out (i.e. the side bolted to the fork leg) so even a spacer wouldn't work. but thats a cool idea, if not maybe difficult to actually do. youd probably end up poping a piston out eventually though.

Cheers

[lostinflyz]

had the rim down to thorpe's today and they knocked 2mm outta each side of the rim. bolted up she is primo. turned the wheel round in about 2 hours so big props to them. now just have to find all the missing bolts, turn down the axle and fit some tyres. yippe-ki-yay

cheers to everyone.