brakes on new rims not gripping same...

[ctatv]

so i got my supermoto rims off and my dirt rims on. haven't ridden it but just pushing into the garage I noticed the brakes really aren't gripping very well. (the dirt rims have their own brake disks. I am assuming its just cause those rotors haven't been buffed up by any brake pads for at least 3 years. I'm assuming after I give a couple good squeezes on the brakes the pads should start to grip on the disks. am I right or do i need to look into something else not being right?

[MICK]

They've probably got some residue on them from sitting around. I would just be carefull for the first couple corners.

I routinely get WD40, tire foam, soap, aluminum polish...you name it on my discs every wash. Brakes don't work for two laps.

[90cr500guy]

your supermoto wheels have over sized disks?

I'm thinking the difference you may be feeling is the larger diameter wheels with a smaller rotor
+ your pads need to wear in the the other rotors

[ctatv]

your supermoto wheels have over sized disks?

I'm thinking the difference you may be feeling is the larger diameter wheels with a smaller rotor
+ your pads need to wear in the the other rotors

Im running stock disks on my supermoto wheelset. I dont race I street ride it and I have never had any brake fade so i dont see the need to spend money on a big front brake kit. and yeah like i had to squeeze hard to ge tthe bike to stop without me sitting on it while pushing it on a flat driveway, but ive got 10 acres of fields & lawn at the house ill putt around and stop frequently this weekend & see if that doesnt get the residue off the rotors. I dont know if the rotors are worn more or less but the brakes should automatically ajust to a different width rotor right? there was no problem getting the calipers/pads over the disks so if anything these rotors might be more worn. it is a 1990 and these rims are by no means new. the whole thing was done a while back frame-off when it was switched to supermoto and I think a new crate engine (as well as upgraded 91+ subframe/seat/airbox & new plastics. I believe the rims are the originals.

the previous owner was in his late 30s and bought it after getting a divorce. his nephue met me to make the hand-off in PA half way between OH & CT. he said it rarely got ridden. really an amazing deal. bike is like new as well as engine, came on 17s on excell wheels & a dirt rim set, extra front fender and extra seat cover to match the nstyle graphics, street motorcycle title, lighting coil lights, etc all for 1700 bucks out the door...

[MICK]

I shouldn't ask but...did you pump the brakes first? Anytime you change a wheel the caliper's pistons get pushed out a little. When you reinstall you gotta pump the brake a couple times to tighten the pistons back up.

And if there is some kind of residue on them, put putting around the house may not work very well? As I mentioned above my brakes frequently don't work for the first two laps at race speed. If I just farted around all day they may never work? You need to build up a decent amount of heat and friction. If you've got the space get the bike up to speed (like 40-50mph) and do a long but hard stop. Once or twice is all it should take.

[ctatv]

I shouldn't ask but...did you pump the brakes first? Anytime you change a wheel the caliper's pistons get pushed out a little. When you reinstall you gotta pump the brake a couple times to tighten the pistons back up.

And if there is some kind of residue on them, put putting around the house may not work very well? As I mentioned above my brakes frequently don't work for the first two laps at race speed. If I just farted around all day they may never work? You need to build up a decent amount of heat and friction. If you've got the space get the bike up to speed (like 40-50mph) and do a long but hard stop. Once or twice is all it should take.

I didnt pump them, and its still street legal and i have a 3 acre field so ill go out and hammer on the brakes for a bit when i get it out and see if that does it...

[ctatv]

doin the changeover... will get some shots uploaded onthe weekend of the final product