Author Topic: euro bb help (Read 902 times)

priv · « **on:** July 24, 2008, 08:28 PM »

i've fitted some primo cranks to a euro bb,but when i tighten the nuts into the spindle

it tightens up onto the bearings and after a few pedal strokes the cranks seize up

if i loosen the nuts in the axle slightly it frees the cranks,but then they're only finger tight and evenually they undo completely and drop out
any ideas how to tighten up the crank arms without seizing the bearings?

i've only really used isis bb's in mountain bikes so this is all new to me

priv

priv

Dark Diggler · « **Reply #1 on:** July 24, 2008, 08:34 PM »

Have you got a spacer tube in there (in the middle of the bearings with the spindle running through it) ?

priv · « **Reply #2 on:** July 24, 2008, 10:48 PM »

no mate,is it like a tube about 2-3 in long?

Trev · « **Reply #3 on:** July 24, 2008, 11:15 PM »

Quote from: priv on July 24, 2008, 10:48 PM

no mate,is it like a tube about 2-3 in long?

like this

priv · « **Reply #4 on:** July 24, 2008, 11:22 PM »

thanks you two,i'll have a root about to see if i've got one

would one of those stop it then?

thecrooch · « **Reply #5 on:** July 24, 2008, 11:43 PM »

yep it sits between the bearings so when you tighten the bolts you dont crush the bearings which is what you were doing....

it needs to be measured correctly so that it sits snug between the bearings

dont worry its a common problem/mistake....

thecrooch · « **Reply #6 on:** July 24, 2008, 11:44 PM »

oh priv i have a couple spare if you need one

priv · « **Reply #7 on:** July 24, 2008, 11:47 PM »

Quote from: Crooch on July 24, 2008, 11:44 PM

oh priv i have a couple spare if you need one

thanks mate,i'll have a look tomorrow to see if i've got one,if not i'll take you up on the offer

priv

thecrooch · « **Reply #8 on:** July 25, 2008, 09:38 AM »

no worries will be at MK will have one in the tool box or can post if you need it sooner

pickle · « **Reply #9 on:** July 25, 2008, 10:51 AM »

i've put my sealed US BB into the Hyper and in my rush i forgot to put in the spacer

will it do the same thing when i pedal? or should it be okay.........the whole thing seems fine but i haven't pedaled yet as i need the spacer for the chainwheel. $:-\$

thecrooch · « **Reply #10 on:** July 25, 2008, 10:54 AM »

Quote from: pickle on July 25, 2008, 10:51 AM

i've put my sealed US BB into the Hyper and in my rush i forgot to put in the spacer

will it do the same thing when i pedal? or should it be okay.........the whole thing seems fine but i haven't pedaled yet as i need the spacer for the chainwheel. $:-\$

take it out and do it properly.... you'll only regret it otherwise.... trust me im a doctor!

pickle · « **Reply #11 on:** July 25, 2008, 10:56 AM »

yeah i know you're right............just a right ball ache! the minute i hit it into the frame i though FOOK!

thecrooch · « **Reply #12 on:** July 25, 2008, 11:28 AM »

Quote from: pickle on July 25, 2008, 10:56 AM

yeah i know you're right............just a right ball ache! the minute i hit it into the frame i though FOOK!

we've all been there before, when i built my retro quad earlier this year the two i got with my profiles were too short so had to get a mate to machine me one to the right length! pain in the ass... quic tap with a socket extension and itll pop out again... you can do it in your lunch break

pickle · « **Reply #13 on:** July 25, 2008, 11:40 AM »

Just done it mate! you should see the look on the guys faces who i share my office with

HEYWOOD BMX · « **Reply #14 on:** July 25, 2008, 11:44 AM »

You can sometimes get away without a tube spacer in a US bb,but not a euro,especially with a 22mm spindle as the bearings are miniscule!

thecrooch · « **Reply #15 on:** July 25, 2008, 02:16 PM »

Quote from: pickle on July 25, 2008, 11:40 AM

Just done it mate! you should see the look on the guys faces who i share my office with

had a feeling you might - i wasnt really joking.... ill pop the top hat washer in the post tomorrow - would it be easier to send to your office?

pickle · « **Reply #16 on:** July 25, 2008, 02:17 PM »

no mate, it'll get lost in the post at work......home is fine and dandy mate

thecrooch · « **Reply #17 on:** July 25, 2008, 02:33 PM »

okeydokey

priv · « **Reply #18 on:** July 25, 2008, 07:04 PM »

Quote from: Crooch on July 25, 2008, 09:38 AM

no worries will be at MK will have one in the tool box or can post if you need it sooner

i'd like to take you up on that please,i'll see you at MK about it

maybe do a deal on some coca cola or beer?

priv

thecrooch · « **Reply #19 on:** July 25, 2008, 07:30 PM »

Quote from: priv on July 25, 2008, 07:04 PM

Quote from: Crooch on July 25, 2008, 09:38 AM
no worries will be at MK will have one in the tool box or can post if you need it sooner

i'd like to take you up on that please,i'll see you at MK about it maybe do a deal on some coca cola or beer?

priv

no worries, its in the tool box - look out for a electric blue FA limo and im the lump on top of it...

DY85262 · « **Reply #20 on:** August 05, 2008, 08:32 AM »

Just sharing a trick with you. You know the spacers you use on your flights on the outside. Well if your tube spacer is too small on the inside you can use the correct spacer to make it the right width. The internal tube prevents the lateral presure on the bearings inner races. If you imagine the outer race is fixed in position by the cup in the BB shell when you tighten the spindle you are trying to push the inner races of the bearings sideways and inwards. That is what the tube is for to prevent sideways movement on the inner races. Ooohh sorry got a little carried away. Hope my tip may help some of you guys. Cheers

Author Topic: euro bb help (Read 902 times)

Trev

thecrooch

thecrooch

thecrooch

thecrooch

thecrooch

HEYWOOD BMX

thecrooch

thecrooch

thecrooch

DY85262