williams Posted February 27, 2012 Report Share Posted February 27, 2012 I have grinded my rims 4 times, 3 of them were with a shitty disc, and the last one (did it today) was with a completely new thin metal cutting disc. I did grind it in a kinda flat angle, like a light grind. The point is: everytime I grind my wheel and go out riding, after about 10 minutes the grind is dead. What do I do wrong? I have a onza rim with RockMan blue pads. one more question, after my grinds the pads doesn't sound anymore and the bite and hold aint there, help please? cheers! Quote Link to comment Share on other sites More sharing options...
CalRobbo341 Posted February 27, 2012 Report Share Posted February 27, 2012 Maybe because your grinding with a cutting disc..kind of in the name? Quote Link to comment Share on other sites More sharing options...
TrialsIsHard Posted February 27, 2012 Report Share Posted February 27, 2012 Maybe because your grinding with a cutting disc..kind of in the name? The disk doesn't matter a whole lot, the tarty video says you can use any kind of disk (I think) It's probably down to your rim Quote Link to comment Share on other sites More sharing options...
williams Posted February 27, 2012 Author Report Share Posted February 27, 2012 Maybe because your grinding with a cutting disc..kind of in the name? what do you mean? i don't really get that... Quote Link to comment Share on other sites More sharing options...
CalRobbo341 Posted February 27, 2012 Report Share Posted February 27, 2012 The disk doesn't matter a whole lot, the tarty video says you can use any kind of disk (I think) It's probably down to your rim You should use a grinding disc really though : all of my cutting discs say 'NOT FOR GRINDING!'... Quote Link to comment Share on other sites More sharing options...
williams Posted February 27, 2012 Author Report Share Posted February 27, 2012 You should use a grinding disc really though : all of my cutting discs say 'NOT FOR GRINDING!'... oh I don't really know what type of disc I have, all I saw was that it's for metal... Quote Link to comment Share on other sites More sharing options...
CalRobbo341 Posted February 27, 2012 Report Share Posted February 27, 2012 (edited) oh I don't really know what type of disc I have, all I saw was that it's for metal... Your words exactly vvvvvvvv and the last one (did it today) was with a completely new thin metal cutting disc Edited February 27, 2012 by Callumm Quote Link to comment Share on other sites More sharing options...
ghostrider88 Posted February 27, 2012 Report Share Posted February 27, 2012 You should use a grinding disc really though : all of my cutting discs say 'NOT FOR GRINDING!'... Cutting discs are better for grinding rims.NOT FOR GRINDING statement is there for safety reasons only because if you push down too hard it might break and at 10000rpm do some serious damage to your body...But when grinding rim,you don´t push it down at all,well at least you shouldn´t. Quote Link to comment Share on other sites More sharing options...
Carlperkins Posted February 27, 2012 Report Share Posted February 27, 2012 (edited) it doesent matter about the disc, i use a cutting disc and its fine. the "not for grinding" means like, not for grinding welds smooth etc as the edge of the disc isn't bevelled and grinding discs are curved so they dont eat into the material you are trying to grind down too. (not a very good description but you should hopefully get the idea) doing a rim every now and then makes no difference if you use a cutting disc. anyway, yeah its probably your rim. grinds should go smooth(er) after a little bit of use obviously but you shouldnt lose braking power, unless the rim is made of low grade material which will wear down. i.e most viz rims as ive heard. so yeah its probably your rim. ahh ghostrider beat me to the punch (with a better explanation) as i was typing. Edited February 27, 2012 by Carlperkins Quote Link to comment Share on other sites More sharing options...
ghostrider88 Posted February 27, 2012 Report Share Posted February 27, 2012 ahh ghostrider beat me to the punch (with a better explanation) as i was typing. See what happens when you overthink things? 1 Quote Link to comment Share on other sites More sharing options...
williams Posted February 27, 2012 Author Report Share Posted February 27, 2012 it doesent matter about the disc, i use a cutting disc and its fine. the "not for grinding" means like, not for grinding welds smooth etc as the edge of the disc isn't bevelled and grinding discs are curved so they dont eat into the material you are trying to grind down too. (not a very good description but you should hopefully get the idea) doing a rim every now and then makes no difference if you use a cutting disc. anyway, yeah its probably your rim. grinds should go smooth(er) after a little bit of use obviously but you shouldnt lose braking power, unless the rim is made of low grade material which will wear down. i.e most viz rims as ive heard. so yeah its probably your rim. ahh ghostrider beat me to the punch (with a better explanation) as i was typing. haha yeah I got it, thanks for the help, well im not sure im very new to the "grinding" but after about 10 mins of riding the grind doesn't feel no where as good as it was after i grinded it, i don't know if this effects the performance to... Quote Link to comment Share on other sites More sharing options...
ghostrider88 Posted February 27, 2012 Report Share Posted February 27, 2012 haha yeah I got it, thanks for the help, well im not sure im very new to the "grinding" but after about 10 mins of riding the grind doesn't feel no where as good as it was after i grinded it, i don't know if this effects the performance to... It´s normal that it doesn´t feel the same on the fingers(pads smoothen the sharp metal shavings or whatever you call them of the rim),but it doesn´t affect the performance at all. Quote Link to comment Share on other sites More sharing options...
williams Posted February 27, 2012 Author Report Share Posted February 27, 2012 It´s normal that it doesn´t feel the same on the fingers(pads smoothen the sharp metal shavings or whatever you call them of the rim),but it doesn´t affect the performance at all. oh I get it, but how do i know if the grind is dead then? but for how long should a light grind last about? Quote Link to comment Share on other sites More sharing options...
ghostrider88 Posted February 27, 2012 Report Share Posted February 27, 2012 oh I get it, but how do i know if the grind is dead then? but for how long should a light grind last about? It will be visibly smoother than new,so you should be able to see it without actually touching the rim.And to the second question,it depends on many factors,but average lifespan of a good grind is 1-2months(based on time spended on the bike) Quote Link to comment Share on other sites More sharing options...
dannytrialskid Posted February 27, 2012 Report Share Posted February 27, 2012 STONE DISC = WIN! 1 Quote Link to comment Share on other sites More sharing options...
ghostrider88 Posted February 27, 2012 Report Share Posted February 27, 2012 STONE DISC = WIN! Not neccessarily. Quote Link to comment Share on other sites More sharing options...
weebryan Posted February 27, 2012 Report Share Posted February 27, 2012 Try a variable speed grinder and slow it down for a rougher finish also takes of less material got mine out of halfrauds Quote Link to comment Share on other sites More sharing options...
dannytrialskid Posted February 27, 2012 Report Share Posted February 27, 2012 Not neccessarily. It is for me, and all my mates that run grinds use stone cutting disc and our grinds last a long time, and work really well. We are all using different rims too. 1 Quote Link to comment Share on other sites More sharing options...
ghostrider88 Posted February 27, 2012 Report Share Posted February 27, 2012 (edited) I have used metal/stone cutting and metal grinding and I found that metal cutting gives the best grind,just as sharp as stone cutting,but more fine somehow. Edited February 27, 2012 by ghostrider88 Quote Link to comment Share on other sites More sharing options...
SamKidney Posted February 27, 2012 Report Share Posted February 27, 2012 Metal cutting discs are brilliant. Ive always managed a nice sharp grind at a 45° angle with almost no pressure being applied. But pretty much any disc should be adequate. I never use my discs for more than two grinds. After that I find they dont give as much of a better grind. Quote Link to comment Share on other sites More sharing options...
gage-mann Posted February 27, 2012 Report Share Posted February 27, 2012 dont know if u do or not but if you drag your brake with a grind it dont last too long. Quote Link to comment Share on other sites More sharing options...
BradJohnson Posted February 28, 2012 Report Share Posted February 28, 2012 When i had my pro the grind didnt last very long too im assuming its the rim, could be the maggy blacks i was using though, just get some good pads mate, makes all the difference, also you could use a little tar Quote Link to comment Share on other sites More sharing options...
dezmtber Posted February 28, 2012 Report Share Posted February 28, 2012 a simple explanition is with ground rims you can ride down hills dragging the brakes. try and just keep the use of the brake to stoping dead on trials riding. i ground my rim quite heavily and the rode down from the roaches like i was on my dh bike my grind was wrecked in 3 mins. and my pads nearly half gone Quote Link to comment Share on other sites More sharing options...
Laurence--Trials Posted February 28, 2012 Report Share Posted February 28, 2012 I found my grind has gone fairly quick, its still got the bite but not as much hold. Quote Link to comment Share on other sites More sharing options...
TommyBrew Posted February 28, 2012 Report Share Posted February 28, 2012 I'm also using rockman pads, and my grinds held for at least 3 or 4 rides, although it held, it never really had massive Bite or sounded effective, although noise isn't everything, just doesn't feel as solid as my brake used to when I used to ride 5 years ago (just got back into trials) Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.