weewillywinky Posted September 6, 2005 Report Share Posted September 6, 2005 Hi there, i have rounded off the bottom bit of the crank where it goes on the bb a fair few cranks in this last year. I was just wondering what makes this happen, and is it something i can prevent. Although it is not on my trials bike it is still annoying me and costing money to sort out :P . If any of you guys out there can help me, thanks very much in advance. :D Quote Link to comment Share on other sites More sharing options...
Lawnmowerman Posted September 6, 2005 Report Share Posted September 6, 2005 Tighten your cranks properly Quote Link to comment Share on other sites More sharing options...
aff1e Posted September 6, 2005 Report Share Posted September 6, 2005 :P get an isis bb , cos it has more corners to round off Quote Link to comment Share on other sites More sharing options...
crazykid Posted September 6, 2005 Report Share Posted September 6, 2005 my craks on my t-pro did it just keep tham tight mate :P Quote Link to comment Share on other sites More sharing options...
bigpimpndave Posted September 6, 2005 Report Share Posted September 6, 2005 my craks on my t-pro did it just keep tham tight mate :D ← My T-pro cranks did that and i just kept buying new crank arms until the bottom bracket snapped :D :P . Its because the the bottom bracket and cranks are square tapered they round off easier than splined cranks/ bottom brackets. In the end i bought a splined downhill (FSA platinum) bottom bracket and a set of tensile 165mm cranks . and that has sorted the problem out :lol: Quote Link to comment Share on other sites More sharing options...
weewillywinky Posted September 6, 2005 Author Report Share Posted September 6, 2005 thanks for the sugestions, hopefully it'll sort the problem out. :P Quote Link to comment Share on other sites More sharing options...
downhill_rob2@hotmail.com Posted September 6, 2005 Report Share Posted September 6, 2005 Its because the the bottom bracket and cranks are square tapered they round off easier than splined cranks/ bottom brackets. ← Not really, ISIS is menna be ALOT easier to round off that tapered, but only if that tapered cranks are tightened and not loose, the they should last you years without failure (Y) Quote Link to comment Share on other sites More sharing options...
beigemaster Posted September 7, 2005 Report Share Posted September 7, 2005 Depends mainly on the crank quality really, I rounded off 3 pairs of Power Pros in 6 months yet I have had my Middleburns (square taper) for 2 years and are still fine. Best you can do it keep checking there tight after a long ride. Quote Link to comment Share on other sites More sharing options...
andyzplace Posted September 7, 2005 Report Share Posted September 7, 2005 Not really, ISIS is menna be ALOT easier to round off that tapered, but only if that tapered cranks are tightened and not loose, the they should last you years without failure :( ← hmm. im afraid not. the nature of the isis design is to prevent round-age and it works very well. have you got any pics of rounded isis cranks/bb's. it would be interesting to see what they looked like. Quote Link to comment Share on other sites More sharing options...
downhill_rob2@hotmail.com Posted September 8, 2005 Report Share Posted September 8, 2005 (edited) My mate rounded a pair of truvativ cranks off, well the non-drive side. but i never got to see it :ermm: he sent it away 30 mins after doing it :huh: He isnt exactly fat either....... quite the oppisite actually! lol (skinny cumsmuggler) He said he could spin the crank round on the BB like it wasnt rounded off :( :- lol oh and he wasnt doing anything big either, done a jump down 5 steps..... Edited September 8, 2005 by terror-error Quote Link to comment Share on other sites More sharing options...
bigpimpndave Posted September 8, 2005 Report Share Posted September 8, 2005 (edited) My mate rounded a pair of truvativ cranks off, well the non-drive side. but i never got to see it :( he sent it away 30 mins after doing it :- He isnt exactly fat either....... quite the oppisite actually! lol (skinny cumsmuggler) He said he could spin the crank round on the BB like it wasnt rounded off :D :D lol oh and he wasnt doing anything big either, done a jump down 5 steps..... ← terror-error if you wer talking about mike your wrong i just called mike and he said that the only crank he has rounded off was his square taperd ones. All he did on them steps was snap his pedal so ur wrong again ( i would give up if a was you :ermm: ) also i would just like to say i told you but you wouldnt have it :huh: n splined are less likley to round of compared to square taperd Edited September 8, 2005 by bigpimpndave Quote Link to comment Share on other sites More sharing options...
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