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Hi I don’t know whether anyone can help I have a BMC team elite SLR01 frameset I am trying without too much success to get a bottom bracket fitted,
The shop I use regularly has got the bb30 bearings in for me and has attempted to fit them to the frame, however he has told me that they are too tight and the frame may need reaming.
Can anyone help i live in Derby so anywhere in the midlands would be good.
Many thanks
Henry
henryf@tiscali.co.uk
surely if the old ones have come out std bb30 should go in?
Surprised if a BMC SLR01 would need reaming - I take it it's a new frame though?
TAKE IT TO A DIFFERENT BIKE SHOP!
yes new frame, My shop thinks the bb is far too tight,it doesnt look like the frame has been reamed. any ideas!
Contact the frame makers, take it to a differnt shop, measure it
YGM Henry
This may be a daft question, but they've not been trying to fit a PF30 BB to a BB30 frame? Otherwise they should press in with a headset press.
Local Cannondale dealer may have more experience with BB30 than elsewhere?
Andy
If bearings are tight I quite often freeze the bearings overnight and warm the bb area of a BB30 Frame/hope hub with an old towel soaked in boiling water. Often you can then fit the bearings by hand! When everything finds the same temperature it is all good!
Good luck
You're gonna need a bigger drill!
Looking at it from an engineering point of view, as opposed to a cycle mechanics. I would measure the bearing outside diameter and the BB shell inner diameter. .001"-.0015" (yes I am that old) interference fit should be about right for that size bearing.
IIRC pf30 is 46 bore
get bikeshop to measure bores with a boremic if its a carbon frame the shell should be to size as its only really welded frames that suffer the distortion and get left undersized to be bored tru later
I think the tolerancing has always been iffy as its a plus for bore
on the bb30 drawing
41+/- mm reamers are expensive and if you have a milling machine its easier to clock 1 thousandth on a boring bar and send it through
Was it bought from Evans? Even if it was bought elsewhere why not take it to their nearest store and get them to fit it. Pay for the work and keep the receipt for the work carried out.