Laurence--Trials Posted October 18, 2010 Report Share Posted October 18, 2010 Today i was riding and i found a crack in my disc rotor (Rockman superlight on the front with an avid BB7) and i was just wondering if it was normal for them to crack after alot of use? Quote Link to comment Share on other sites More sharing options...
Kieran Morrison Posted October 18, 2010 Report Share Posted October 18, 2010 (edited) Possibly wrong but ill take a guess, since the rockman rotor will be light and light mostly = weak, then it will be bendable/crack easy. And if you look at the bb7, (at least in mine) when you pull it in, the rotor will put to one side/ flex. This rotor has possibly been to weak to withstand this flex, and has cracked. Should be normal though, everything cracks at some point Hope i helped you mate Edited October 18, 2010 by Kieran Morrison Quote Link to comment Share on other sites More sharing options...
Luke Rainbird Posted October 18, 2010 Report Share Posted October 18, 2010 For once the kids pretty much on the money. A poorly set up or abused rotor with so little material will crack at some point. Have you knocked it at any point, or been running it for long? Quote Link to comment Share on other sites More sharing options...
Laurence--Trials Posted October 18, 2010 Author Report Share Posted October 18, 2010 Possibly wrong but ill take a guess, since the rockman rotor will be light and light mostly = weak, then it will be bendable/crack easy. And if you look at the bb7, (at least in mine) when you pull it in, the rotor will put to one side/ flex. This rotor has possibly been to weak to withstand this flex, and has cracked. Should be normal though, everything cracks at some point Hope i helped you mate True.. and yes but i have my right pad (the one that it pushes the rotor onto right up against the rotor as close as i can get it without rubbing. For once the kids pretty much on the money. A poorly set up or abused rotor with so little material will crack at some point. Have you knocked it at any point, or been running it for long? I'm pretty sure i haven't hit it at any point and no i haven't had it for long but it was second hand off a mate, i don't know where he got it from though. Quote Link to comment Share on other sites More sharing options...
Matt Vandart Posted October 18, 2010 Report Share Posted October 18, 2010 For once the kids pretty much on the money. A poorly set up or abused rotor with so little material will crack at some point. Have you knocked it at any point, or been running it for long? I concur. Laurence, you want to have the non moving pad the closest possible without rubbing. Quote Link to comment Share on other sites More sharing options...
Laurence--Trials Posted October 18, 2010 Author Report Share Posted October 18, 2010 I concur. Laurence, you want to have the non moving pad the closest possible without rubbing. Ahh see i'm a smart one Also i find this helps with better hold / bite Quote Link to comment Share on other sites More sharing options...
Shaun H Posted October 18, 2010 Report Share Posted October 18, 2010 (edited) The Ashima/Rockman rotor seems to be pretty well designed, but it's also very light. Where has it cracked, it's either a material failure or a not so obvious stress raiser. EDIT: It's probably worth mentioning that one generation (maybe the first) of Hope Mono Trial rotors had a problem with premature cracking which seemed to be down to an unforeseen stress concentration in the design. Edited October 18, 2010 by Shaun H Quote Link to comment Share on other sites More sharing options...
Laurence--Trials Posted October 19, 2010 Author Report Share Posted October 19, 2010 The Ashima/Rockman rotor seems to be pretty well designed, but it's also very light. Where has it cracked, it's either a material failure or a not so obvious stress raiser. EDIT: It's probably worth mentioning that one generation (maybe the first) of Hope Mono Trial rotors had a problem with premature cracking which seemed to be down to an unforeseen stress concentration in the design. Okay you see the picture of the rotor, where each bolt goes/ each hole is connected to one short little bar bit and one long one its one of those long joins/ bars. Sorry for bad description. Quote Link to comment Share on other sites More sharing options...
Shaun H Posted October 19, 2010 Report Share Posted October 19, 2010 If it's cracked where I've highlighted that wouldn't seem unusual if that's where you're trying to describe. It's the member which will be carrying the load from the brake caliper to the hub and the highlighted areas is of minimum cross section. The "small arm" as you described it will just be stiffening the central area and won't carry much force. Quote Link to comment Share on other sites More sharing options...
Laurence--Trials Posted October 20, 2010 Author Report Share Posted October 20, 2010 (edited) If it's cracked where I've highlighted that wouldn't seem unusual if that's where you're trying to describe. It's the member which will be carrying the load from the brake caliper to the hub and the highlighted areas is of minimum cross section. The "small arm" as you described it will just be stiffening the central area and won't carry much force. On that picture Its very slightly up and left. EDIT: While i'm here would anyone have any uses for it? Edited October 20, 2010 by Laurence--Trials Quote Link to comment Share on other sites More sharing options...
Laurence--Trials Posted October 21, 2010 Author Report Share Posted October 21, 2010 EDIT: While i'm here would anyone have any uses for it? Quote Link to comment Share on other sites More sharing options...
N.Wood Posted October 21, 2010 Report Share Posted October 21, 2010 No just chuck it in the bin or use it to stop hot saucepans burning your mums nice tablecloth. Quote Link to comment Share on other sites More sharing options...
Laurence--Trials Posted October 21, 2010 Author Report Share Posted October 21, 2010 No just chuck it in the bin or use it to stop hot saucepans burning your mums nice tablecloth. Oh okay Quote Link to comment Share on other sites More sharing options...
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