Bottom BB sizing

[bianco]

Hi guys

Bought a new crankset, and a new BB.

Guy at chain reaction sarcastically informed me I needed a 109mm spindle length. The sarcasm indicated it could be any other fit.

The chain rubs the outer chainring on the highest 2 gears, should I get a 113mm spindle length to compensate?

 

[Smokin Joe]

They all do that, John.

The chain is running out of line when you are on the smallest ring and the smaller sprockets, it is not a combination that you should use. In any case you will be able to get near enough to those ratios with the big ring and a couple of the larger sprockets.

 

[bianco]

It didn't on my previous crankset, and it's only a double

 

[TheDoctor]

What chainset is it?

 

[bianco]

What chainset is it?

Ritchey WCS Road V Double - octalink fitting

 

[TheDoctor]

Pretty sure octalinks only come in 2 lengths - one for a double and one for a triple.
Maybe the BB on your last crankset was a bit too long? Little ring / little sprocket combinations are always bad, and always avoidable, like Smokin Joe said.

 

[Monty Dog]

There is only one Octalink BB length for a double - 109mm. Chainrub is a common affliction of modern drivetrains - if you find you need to be in the smaller sprockets, shift to the big chainring.

 

[bianco]

Cheers Monty Dog, a little annoying thats all.

I used to be able to use all sprockets on either chainring, must be something I need to get used to!

 

[fossyant]

Nothing to worry about - I can't use the bottom two sprockets when in my small chain ring, plus, as had been said, the chain is running at a poor angle.

 

[bobg]

Might a 10 speed chain help? that tiny bit less width cured the irritating run I had on the rear mech. Just a thought...