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aka baycat
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8,480 Posts
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Yo!

Picked up a crankset to try out that runs an ISIS bottom bracket. A 22/33 t with an outer bashguard. Looks to be an older form of a system that suffers from quickly worn bearing, leading to the use of a more popular external type of system. Running a square taper setup on my single speed and loving the simplicity, but then that might be the one gear thing.

Are there any pros to an ISIS system? Is there a good BB out there?

Enduro seals sells some 'better' bearings so that might cure some ills

http://www.enduroforkseals.com/id233.html
 

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bike dork extraordinaire
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628 Posts
I ran a bunch of isis cranksets a few years ago, but upgraded to external BB cranks on most of my bikes due to the short lifespan of isis bottom brackets. I do still have an older truvativ stylo isis crankset on one bike that is still running on the original BB from 2003, but that is the exception. I had one isis BB that literally lasted 2 weeks. The good news is you can find the bottom brackets for as little as $15, which makes replacement cheap.
 

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What Alex said. Not much of a hassle and even in DH application I was getting 1 summer of the BB. What was the pain for me is there shift load of different BB's. For DH application (118mm spindle 73mm shell) I had all sort of compatibility issues with chainline and chainguides. That was main reason I moved all bikes to X-Type/Shimano BB's.

On longevity, I had good experience with RaceFace Evolve series. Truvativ was piece of junk. FSA are so so. Good reviews on Crank Broth, but it's expensive.
 

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Let's ride
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buy the CB BB. You can't beat their warranty.

Kent runs the CB BB for 22 hours at Coolest, and it is still ticking strong. He pulled it out after the weekend and water poured out, but it is still smooth.
 

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I switched to Hollowtech II a couple of years ago because I was dissatisfied with ISIS BB life. If I were to go back to using ISIS, I'd give one of the SKF bottom brackets a try. These bottom brackets use roller bearings and should last a lot longer than those which use ball bearings.

There are also some outboard bearing ISIS systems, but I gather that there are sometimes issues with clearance and compatibility.
 

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ISIS here

Im on my 2nd cobalt after CB warranted my 1st no questions asked. Also used the RF SRX but thought the cups were kinda soft. I hear the SKFs are bulletproof.
 

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I run a ISIS system on my all mountain bike and have been totally disappointed with BB life. A year and a half ago I tried like heck to source one of the SKF BB's but couldn't find anything available (like the above link to Jenson - UNAVAILABLE). I put on a FSA Plat Ti BB and, wonder of wonders, it's been good for about a year and a half! When it goes I'll probably just get a different, non-ISIS, crankset
 

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I raced CC on the ISIS BBs and I could only get one season out of them. Every stankin' year I had to replace them. Although I don't ride nearly as much now as I did when in training, the external BB setup that I ended up buying has already lasted 2 years.
 

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Crazed Country Rebel
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6,345 Posts
baycat said:
Yo!

Picked up a crankset to try out that runs an ISIS bottom bracket. A 22/33 t with an outer bashguard. Looks to be an older form of a system that suffers from quickly worn bearing, leading to the use of a more popular external type of system. Running a square taper setup on my single speed and loving the simplicity, but then that might be the one gear thing.

Are there any pros to an ISIS system? Is there a good BB out there?

Enduro seals sells some 'better' bearings so that might cure some ills

http://www.enduroforkseals.com/id233.html
If you don't mind the extra weight, run the DH version of ISIS BB's - with quad bearings.

The issue with ISIS is not the seals, it's the high load and small surface area of the ball bearings. Doubling the bearings really helps - but also increases weight 50 grams or so.
 
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