BB diagnosis & repair

apple eater

Following my last ride at Gorlech trail it appears that my BB's may be kapput. The bike is a vulcan disc spec from 2011

The is a slight clicking when the crank is turned and there is a side to side play in it of about 3 - 5mm.

Are these bb units complete or can the bearings be bought and fitted seperately? Are there special tools (besides the tool to remove the threaded nuts that hold the bb's inside the frame) that i will need?

I have a triple size set of pullers but that's it for now.

nicklouse

it all depends on the BB.

so what is fitted?

heez29

If its original it should be a square taper BB. 118mm length IIRC. Is could be ISIS though.

Need 8mm allen key, crank puller and Shimano BB tool.

apple eater

the only info i can get at the moment is that the crank is a Truvativ x-flow. The park tool bit hasn't yet arrived to strip it down yet.

nicklouse

could be square taper or a splined BB. take the bolt out and look.

apple eater

having now removed the bb the details on it are

chin taur ch52-68 113en bc 1.37x24t i believe square taper looking at the way the crank was set up.

i know it's probably the bog standard one but what can i replace it with?

cooldad

Any square taper BB, 68x113. 113 is the axle length.

apple eater

or what measurements do i take to replace just bearings?

the code on the bearing is 163110-2rs?

outer diameter measures 31mm inner diameter 21mm

heez29

Just replace the unit, they cost about a tenner.

apple eater

the only thing i can find which is better than a two penny job is this

http://www.ebay.co.uk/itm/Shimano-Botto ... 3a77ac9ca1

but if i can get something a little better again i'd be pleased.

apple eater

any experience of this make

http://www.ebay.co.uk/itm/I-R-D-QB-75-B ... 1e7a101902

apple eater

or this one?

http://www.ebay.co.uk/itm/2012-Truvativ ... 4ac262d61b

cooldad

£36 for a square taper? Crazy.
The Shimano is good quality and should last years. I have BB's that are 25 yrs+ still going strong.

The Rookie

Shimano, no question....if you're thinking of spending that much, spend another £25 and fit a Deore HT2!

apple eater

shimano un55 fitted today. It's a bit heavy but hopefully will last longer than the one that came out.

The Rookie

Shimano square taper are probably the most reliable BB you can get....not that Chin Haur are bad, but it's not unknown for the UN's to last 3-4 years.