RADBMX.CO.UK

Technical & Reference Section => Tech and Restoration => Topic started by: 2020mad on March 25, 2006, 12:00 AM

Title: profile crank help needed
Post by: 2020mad on March 25, 2006, 12:00 AM: help, still building my bike for epic.
trying to fit profile cranks to my bike only problem is if i put washers on crank arms the crank tightens up and won,t turn . but if i take a washer out the arms catch rear of frame ... please help been trying to get this ready all week to take tommorow.
Title: Re: profile crank help needed
Post by: billstup on March 25, 2006, 12:07 AM: There should be a shim in between the bearings in the bottom bracket, so when you tighten them up they don`t get tight, if you know what I mean :daumenhoch:
Title: Re: profile crank help needed
Post by: 2020mad on March 25, 2006, 12:13 AM: thanks, will try but i think i,ve been sold a scrap set as cannot tighten arms any where near enough with crank tool so they seat properly. they had these washers on when i bought frame and cranks :(
Title: Re: profile crank help needed
Post by: diesel on March 25, 2006, 12:24 AM: have a look on the custom riders website they sell all the parts you will need.
Title: Re: profile crank help needed
Post by: ORB on March 25, 2006, 12:24 AM: OK

Strip em down and start afresh.

1st, put in one side of the BB, whack her in with a big ole 'ammer, then drop the steel tube in and put the spindle through the bearing that is installed, but only enough so that it dont pertrude the side, make sure the tube slots over the spindle,

bray in the other bearing.

slot the spindle through.

no washers but build up dry and see how much room you got when all tightened up, calculate how many washers you need.

take to bits and put the washers on

tighten up again.

done.
Title: Re: profile crank help needed
Post by: ORB on March 25, 2006, 12:25 AM: that made no sense, but i know what i mean.
Title: Re: profile crank help needed
Post by: jimwise68 on March 25, 2006, 12:46 AM: If all else fails, just take it to Epic and Orb will sort it out for you! :daumenhoch:
Title: Re: profile crank help needed
Post by: 2020mad on March 25, 2006, 01:01 AM: o.k so i think i,ve been done. no tube in between bearings. can you buy these seperatly or has anyone got 1 for sale!!!!!!!
Title: Re: profile crank help needed
Post by: fuzzynod on March 25, 2006, 08:06 AM: Yeah you can buy em seperatley give it a go if not bring it all to epic early 7.00 ish and i maybe able to help failing that you can have a ride on my bike. :daumenhoch:
Title: Re: profile crank help needed
Post by: lazychubs on March 25, 2006, 08:37 AM: ok ive found two spare ones .one as been cut down a tad
but will bring em both with me
Title: Re: profile crank help needed
Post by: Flaz on March 25, 2006, 10:08 AM: i will bring me hoffman just in case :daumenhoch: (seeing as i aint able to ride it :'( )
Title: Re: profile crank help needed
Post by: 2020mad on March 25, 2006, 10:18 AM: cheers guys, will be there at 7. might be bringing another bike aswell if i can fit in car. :daumenhoch: :daumenhoch: :daumenhoch:
Title: Re: profile crank help needed
Post by: TwoBobRob on March 25, 2006, 10:21 AM: This is very very common. Do not worry. I never ran a bearing spacer on my Condor ever..... A lot of riders left them out so they could slightly over tighten them so their cranks didn't rotate during no-footers.

So, build your crankset up with washers as required to allow for frame spacing, then add a little threadlock to the two crank arm bolts and 'nip' them up to the point where the whole thing is spinning as you would like it. Job done ;)

Obviously, over tightening them will kill the bearings but you would have to go crazy tight to actually do that.....

I know this is not correct from an engineering point of view but in reality it's no problem whatsoever :)
Title: Re: profile crank help needed
Post by: 2020mad on March 25, 2006, 02:48 PM: will bring it with me, sounds like there,s a few people not riding tonight that will have a look for me thanks again all. :)