1337 Trials Posted March 28, 2012 Report Share Posted March 28, 2012 Hello. Was out riding tonight on my mtb and all of a sudden it felt as if the cranks were lose. I tried to rattle the crank arms but the whole crank arms/bottom bracket moved together inside the casing. I have the truvativ cranks with the external casing (quite a few years old now) so im not sure which bearings (if that is the bearings that are gone) that I will need. /Thanks Quote Link to comment Share on other sites More sharing options...
monkeyseemonkeydo Posted March 28, 2012 Report Share Posted March 28, 2012 Are you sure the BB's not just come loose? Quote Link to comment Share on other sites More sharing options...
1337 Trials Posted March 28, 2012 Author Report Share Posted March 28, 2012 Are you sure the BB's not just come loose? It may have. Ile have to borrow the 8mm hex key of a mate to take the cranks off a check it first. The bearings seem to be just over £20 which I really can't afford right now so I hope its not the bearings. Quote Link to comment Share on other sites More sharing options...
1337 Trials Posted March 29, 2012 Author Report Share Posted March 29, 2012 Just checked it over and its the bb cup that has split. Im having trouble getting the left side bolt off (side the bb cup is cracked). Ive put some lube in the bottom and use a metal bar on the end of the hex key but the bolt is rounded off. I have no problem getting the drive side bolt out. Looks like im going to have to pay £30. £15 for the bb cups and £15 for the bike mechanic to drill the bolt out. Quote Link to comment Share on other sites More sharing options...
Matt Vandart Posted March 30, 2012 Report Share Posted March 30, 2012 Bummer. Quote Link to comment Share on other sites More sharing options...
Si-man Posted March 31, 2012 Report Share Posted March 31, 2012 Could do with going on a "how not to round a massive 8mm bolt off course" too. Quote Link to comment Share on other sites More sharing options...
supafly1982 Posted April 2, 2012 Report Share Posted April 2, 2012 is it a square taper BB? Quote Link to comment Share on other sites More sharing options...
1337 Trials Posted April 2, 2012 Author Report Share Posted April 2, 2012 is it a square taper BB? No its ISIS. Not to bad, £15 for the cups and to change them over. £30 for the whole new BB. I was going to drill it out myself yesterday but I only have drill bits for wood/brick. Quote Link to comment Share on other sites More sharing options...
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