Hollowtech II in 105 groupset: Maintenance

Will Nunez

My cranks seem dont seem to run smoothly. Not lumpy or loose. But when chain taken off doesnt freewheel at all. I would expect a lot less resistance. Or is this expected behaviour.

If its not what can be done? Is there some lubing that can be done easily or am i into crank removal terrioty? Can the bearings be replaced or do i need a whole new bottom bracket?

Ive replaced a powerspline on my old bike and it was a right balll ache. Is Hollowtech any easier or is the LBS territory?

nicklouse

presumong the Shell has been faced and therefor there is no resistance due to missaligned bearings it is normal as the the seals are bigger and cause more friction.

Will Nunez

Nicklouse, the bracket on the bike is the original Hollowtech 105 5700. Its done 3500 miles now. Frewheels like its in porridge. The resistance is constant rather than irregular.

As yet Ive not tried to remove it, See that as a last resort as worried about threading if it comes to replacement.

Google doesnt show that i can get replacement bearings. So Im guessing unless someone has a clean/lube tip which doesnt involve stripping the BB, that Im in replace the BB territory

jibberjim

Just replace the BB, they're very cheap (under 4 quid for a tiagra one with Rose at the minute for example - although they'll charge shipping of course)

Will Nunez

Oh what the hell :P

Ill even get ultegra!! I assume ultegra is ok to use with 105 cranks

Is 3500 miles low for a bb, my powerspline on the other bike lasted 6500

ugo.santalucia

Will Nunez wrote:

Oh what the hell :P

Ill even get ultegra!! I assume ultegra is ok to use with 105 cranks

Is 3500 miles low for a bb, my powerspline on the other bike lasted 6500

It's below average.... my Tiagra BB is still good after 5000 miles of winter rides, cobbles, mud etc. etc.

k-dog

I was disappointed with the performance of mine - they definitely spin less even with no chain than older models I've had.

But, that just seems to be how they are - I have a new one and it's basically the same. As long as it's smooth and not crunchy then it is probably fine and you should get quite a few more miles out of it.

keef66

Mine's like that but I don't care as long as it's smooth. I'm of the 'If it ain't broke, don't fix it' school.

billysan

It is very easy to apply too much torque to the end bolt when installing HT2, even with the deliberately small tool you use to tighten it.

With it set at the correct torque you should be able to get between 1 & 1.5 turns out of the cranks with a light flick (this is for standard non DA Shimano HT2 BB's).

Will Nunez

Ill be nerdy and post a you tube tonight and go for a vote on wether you guys would worry or not. LBS is not so local before that is recommended

Will Nunez

Is there benefit from using this http://www.cyclistno1.co.uk/features/ma ... ervice.htm to take crank out and simply regrease contact points?

Will Nunez

Answered my own post. Grease worn away when crank removed. Grease reapplied and back to smooth running. Bottom bracket still has life in it