ISIS or square taper

[langer]

Now, say I was going to treat myself to some new middleburn cranks and say I currently have a Crank bros ISIS bottom bracket on my current ride. Would you be more inclined to keep the bottom bracket and buy and ISIS crank or switch over to square taper? I'm thinking with the 5 year warranty on the crank bros BB, I should be golden. The crank bros ISIS offering seems to be holding up very well.
-jon
ps this all stems from my persistent loosening crank bolt - I think I buggered the ISIS interface. No matter how hard I crank it down, it'll loosen up halfway through a ride.

Cheers!
-jon

[allencb]

I've been eyeing a set of Middleburns as well. I've heard enough complaints about ISIS to steer clear of that one. I've run nothing but square taper my entire cycling life and have never had any problems. I removed my cranks yesterday (to weigh them for comparison purpses) for the first time since I built my 1x1 last Fall and had a bear of a time getting them off.

BTW, have you tried threadlock? A bit extreme, but better than buggering your cranks due to a loose bolt...

FWIW, MTBtandem's price at the moment is $225 for an RS7 with a XC triple spider. Shipping is $8 to this area.

Chris

[joep]

I've been eyeing a set of Middleburns as well. I've heard enough complaints about ISIS to steer clear of that one. I've run nothing but square taper my entire cycling life and have never had any problems. I removed my cranks yesterday (to weigh them for comparison purpses) for the first time since I built my 1x1 last Fall and had a bear of a time getting them off.

BTW, have you tried threadlock? A bit extreme, but better than buggering your cranks due to a loose bolt...

FWIW, MTBtandem's price at the moment is $225 for an RS7 with a XC triple spider. Shipping is $8 to this area.

Chris

Also consider going to Chain Reaction Cycles online. I got a good price from them last time (~$195 including shipping + long distance phone call), but that was back then before the dollar fell against the euro.

[allencb]

Also consider going to Chain Reaction Cycles online. I got a good price from them last time (~$195 including shipping + long distance phone call), but that was back then before the dollar fell against the euro.

I priced the cranks with them (using their webpage, not calling) and the price was about the same as mtbtandem PLUS the near $30 shipping charge.

Chris

[g_barr]

ISIS vs square taper, pro and con. (http://www.more-mtb.org/forum/showthread.php?t=10502)

[langer]

I had trouble with the aforementioned creaking at the crank/BB interface of my last square taper (RaceFace Next LP). It's the main reason I'm shying away from giving it another go. Had to pull the cranks every month or so to slap some more grease on the spindle, even though some folks say not to lube.

allencb: I did have some blue loc-tite on there. I don't want to use red, my carbon cranks wouldn't fare so well when I have to blow torch my bolt off.

[allencb]

Yeah, I don't think I'd go for Red either. :)

As for the BB noise, I've never greased my spindle (heh heh) and I never get noise from it. I also crank down pretty dang hard on the crank bolt, probably in the range of 40ft/lbs.

Chris