[iloveclimbinghills]

can I switch out the Shimano 4 taper bottem braket for an isis bottem braket ?

 

[GearHead]

can I switch out the Shimano 4 taper bottem braket for an isis bottem braket ?

Yes, if that is what the new crank requires. Otherwise No.

 

[Hudnut]

square peg ... round hole.... nope.

 

[Hecubus]

square peg ... round hole.... nope.

Precisely. You need to use whatever bottom bracket fits the crankset you will use. If you go to ISIS you need ISIS cranks.

 

[iloveclimbinghills]

dam... thanks for the info, guess ill have to save up some more money

 

[logbiter]

dam... thanks for the info, guess ill have to save up some more money

is your square taper BB toast?
slap a shimano un (52 or 72) in there for $20-30 and you're good to go for a looonngg while.
What's going on that you need a new BB?

square taper cranks are still an excellent way to go, don't be fooled by the hype of ISIS or external bearing cranks.

 

[Hudnut]

is your square taper BB toast?
slap a shimano un (52 or 72) in there for $20-30 and you're good to go for a looonngg while.
What's going on that you need a new BB?

square taper cranks are still an excellent way to go, don't be fooled by the hype of ISIS or external bearing cranks.

for sure. I've been using the same Shimano UN-72 BB and raceface turbine LP cranks since 96 or 97 (it's been a long time). The setup has been on 4 frames. If it aint broke don't fix it.

 

[standard235]

I have beaten the living crap out of my RF Evolve FR ISIS BB and it still spins smooth as ever.

I'm just one lucky SOB.

Do as logbiter says unless your cranks are toast.