Which bottom bracket?

[jammie*dodger]

Hi, can anyone tell me which bb I need for my 1999 specialized fsr comp? Google is suggesting a couple of different ones. I could take the old one out but am riding it almost every day and don’t want to take it out of action for longer than necessary.

Thanks, Rob.

 

[simdagger]

73mm with a 110mm spindle according to their specs

 

[jammie*dodger]

73mm with a 110mm spindle according to their specs

Fantastic, thanks. I’ll get one ordered now.

Cheers.

 

[jammie*dodger]

73mm with a 110mm spindle according to their specs

Fantastic, thanks. I’ll get one ordered now.

Cheers.

Man that’s a hard size to find. Do you think a 73 x 113 would be ok?

Are the thread types likely to be the same?

 

[simdagger]

73mm with a 110mm spindle according to their specs

Fantastic, thanks. I’ll get one ordered now.

Cheers.

Man that’s a hard size to find. Do you think a 73 x 113 would be ok?

Are the thread types likely to be the same?

Threads will be the same,


I couldn't tell you if it will be ok i just looked at the specification sheet for the bike, your bb will have a shell width 73mm and you cranks will require a certain spindle length...this will affect your Q-factor and chainline. You can get shell spacers to center your BB which will work but it depends on if you're happy with making it work over 'being correct'.

 

[jammie*dodger]

Re:

Thanks. It looks like it’s cheap enough to buy the 113mm. I’ll give it a go and see. I reckon if I have to buy 1.5mm adjustment on the front derailleur I can make that work.

The squeak from the BB right now means I need to do something

 

[mk one]

Re: Re:

The squeak from the BB right now means I need to do something

Tighten the bb? habit of coming loose in full suss frames.

 

[simdagger]

Re: Re:

The squeak from the BB right now means I need to do something

Tighten the bb? habit of coming loose in full suss frames.

Good point

One of my Wiliers had the nastiest creaking...turned out to be titanium skewers.

On a full sus, it could be literally any point in the system. Lock it all out, pedal on the flat seated, then try unseated, try it in a stand, see if it creaks without the cranks etc etc

Chasing creaks around a frame can be infuriating!

 

[Takingabreak]

Re: Re:

The squeak from the BB right now means I need to do something

Tighten the bb? habit of coming loose in full suss frames.

Good point

One of my Wiliers had the nastiest creaking...turned out to be titanium skewers.

On a full sus, it could be literally any point in the system. Lock it all out, pedal on the flat seated, then try unseated, try it in a stand, see if it creaks without the cranks etc etc

Chasing creaks around a frame can be infuriating!

I spent a couple of years chasing crank squeaks only to find it was my brooks saddle

 

[FluffyChicken]

Re:

The 110 length would only be correct.if it was the original crank, change the crank and the length might change

110 (and 107) would give a 47?5 chainlike with the cranks that go with them.
113 gives a 50mm chainline an in spec alternative, which then became.the normal for 9 speed setups and on until all this boost and megamulti large rear ring setups that change every two years.