External BB for Isoflow

BikerDan

After been through 2 ISIS drive bottom brackets (this will be the third) im getting rather fed up of unreliability of them. :x Is it possible to convert Truvativ Isoflow cranks to accept external bottom brackets like Shimano Hollowtechs or Truvativ Giga X pipes? Or do i need a whole new crankset?

supersonic

Cant be done, as the axle is itegrates to the chainset with the newer type. You will need to replace the lot.

Splasher

Technically, you could achieve an external bearing set-up using one of these



but I wouldn't bother. I doubt it's any better.

Splasher

http://www.chainreactioncycles.com/Mode ... delID=8409 at £35

and http://www.chainreactioncycles.com/Mode ... odelID=908 for £15

will outlast most other stuff.

supersonic

I'd have the LX for the same money!

http://www.chainreactioncycles.com/Mode ... delID=2369

Needs a 121BB for a 47.5mm chainline

Splasher

I reckon the Deore is lighter. Not the chainset itself but the 121mm BB needed for the LX has a lot of extra steel in it compared to 113mm for the Deore!

supersonic

Not 100g though! There is about 10g in the BBs I think.

Splasher

There's 60g (measured) between the two chaninsets in the same 175mm 22/32/44 config. But I concede that there's not going to be that much of a difference between a 113mm and a 121mm BB of the same spec.

Personally, I'd go for the Deore myself but only so I could run an XT BB.

BikerDan

I was worried that it could be pricey but £35 for a new crankset seems good. How is the LX compared to the isoflow spec wise?

supersonic

Isoflow is a heavy, budget crank, not as stiff as LX either. Chainrings last though.

BikerDan

Right LX cranks for my Commencal it is then, thanks!

Splasher

Remember you need the 121mm Bottom Bracket as well. And tools if you're doing it yourself.