American Classic ISIS Bottom Bracket Bottom Brackets

1.25/5 (8 Reviews)
MSRP : $110.00


Product Description

With our ISIS design, the cro-moly axle is placed as close as possible to a uniform tube with splines on the end. Competitor's bottom brackets place bearings on the spline. Bill Shook, designer of the American Classic ISIS BB, uses a split aluminum ring on each side that fits behind the spline, and upfront of a small shoulder.


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Reviews 1 - 5 (8 Reviews Total) | Next 5

User Reviews

Overall Rating:1
Value Rating:1
Submitted by longcoolmother a Recreational Rider

Date Reviewed: April 16, 2007

Weaknesses:    crappy design
non-durable


Bottom Line:   
bearings shot in 500 miles-- i have the previous generation, and servicing the bottom bracket was a nightmare. design flaws throughout including near inability to remove old bearings.


Overall Rating:1
Value Rating:1
Submitted by Keith a Recreational Rider

Date Reviewed: July 24, 2006

Strengths:    None

Weaknesses:    The design - lacks design.

Bottom Line:   
There’s no doubt about this bottom bracket – it has a serious design flaw. The bear on the drive side is not captured, and after a period of time the bear comes loose of the housing and migrates away from the frame pulling the split pins apart and detaching the bearings from both the drive and non-drive side. The cup on the drive side has a seat that stops the bear heading inwards but there’s nothing to stop it heading outwards – it relies upon the non-drive bearing assembly to keep it in place. It’s only a question of time before the axle is pulled off the bearing housing housings and your troubles will begin.

However a drop of green loctite when you’ve re-seat the bearing on the drive side (assuming you’ve taken it all apart and re-assembled everything in place) will keep the bearing fixed in the housing.

This product is 10/10 for effort but 1/10 for performance

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Favorite Ride:   Anywhere

Price Paid:    $90.00

Purchased At:   Pedal Power - lExing

Similar Products Used:   FSA - Campagnolo - Specialties

Bike Setup:   Merlin Aegilis, 10 speed Chorus, Stronglight Vulcan compact, Mavic SSL's, FSA k-wing, Stella stem.


Overall Rating:1
Value Rating:1
Submitted by RoadieRob a Road Racer

Date Reviewed: June 16, 2006

Strengths:    Light

Weaknesses:    Failed after only a few months and hardly any miles.

Bottom Line:   
POS is true - bearings are binding on me after 500 miles due to a bent spindle. I'm only 200 lbs. - the engineering on this BB is worthless (most of AC's other stuff is shoddy at times too - be careful!).

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Favorite Ride:   Kettle Moraine roads (Wis)

Price Paid:    $60.00

Purchased At:   eBay

Similar Products Used:   FSA, Token, Race Face

Bike Setup:   Airborne Valkyrie, Dura Ace, X-Lites, FSA SL-K crank


Overall Rating:1
Value Rating:1
Submitted by Rob a Road Racer

Date Reviewed: June 16, 2006

Strengths:    Light

Weaknesses:    Like the others have said, lousy engineering - I put in my 3-bearing FSA "tank" and what a difference. I'll gladly add back 150 grams for smooth pedalling!!!

Bottom Line:   
Yep, it's a certified POS. I just got back from a century ride today and for 97 miles, I had a constant "click" on the top of the drive-side downstroke. I had 400 miles on it prior to today's 100. When I took it apart in the evening, there was a noticeable "bind" in the spindle / bearings. It sure was frustrating realizing that I was WASTING MY ENERGY over 5 hours as a result of this crappy BB. BTW, I'm 200 lbs. and it was on an Airborne titanium. It should be able to handle that combo for more than 400-500 miles!

Expand full review >>

Favorite Ride:   Kettle Moraine State Forest (WI)

Price Paid:    $60.00

Purchased At:   ebay

Similar Products Used:   FSA, Race Face, Token (all ISIS)

Bike Setup:   Airborne Valkyrie, Dura Ace, FSA SL-K cranks, ITM Millenium, Thomson post, Bontrager X-Lites, and $100 in ti bolts all over the place (17.7 lbs on a digital hanging shop scale)


Overall Rating:1
Value Rating:1
Submitted by ndbike a Road Racer

Date Reviewed: May 3, 2006

Strengths:    Are you kidding me?

Weaknesses:    Durability, Truvative style cups, bearings, EVERYTHING!

Bottom Line:   
This is a follow up to a previous review. I contacted American Classic and as another reviewer he said they were very quick to send me new bearings. I sat on them all winter as I really don't need a super light BB for winter training.

Last week I decided to change the bearings in order to re-install this BB for the race season. After taking the old ones out I decided to pull the dust seals off just to take a look at the insides. To my absolute horror I found the drive side bearing was short two balls compared to the non-drive bearing. HOW IS THIS POSSIBLE? I found no remains of ground up ball bearings so my only answer is American Classic shipped it to me this way. That is pathetic quality control in my mind.

I installed the new bearings and raced over the weekend. Last night I went for a ride and to my disgust the BB was making such loud cracking noises it ruined my ride. I'm an ex shop mechanic and I know what I'm doing. The BB was installed properly with a torque wrench to the American Classic specs. This product has some serious flaws and I'll be taking it back out to replace it with an FSA BB.

This BB is just like the rest of the American classic stuff in my opinion, very light but not at all durable. This stuff is made for a weight weenie who uses their equipment once or twice a year. What a POS!

Expand full review >>

Favorite Ride:   Sierra de Cadiz

Purchased At:   my LBS

Similar Products Used:   FSA, Truvative/Bontrager

Bike Setup:   CYFAC Starship, Bontrager Race-X-Lite Tubulars, Campy Chorus Carbon, FSA, Easton, etc...



Reviews 1 - 5 (8 Reviews Total) | Next 5

Review Options:  Sorted by Latest Review | Sort by Best Rating


Need help properly sizing an ISIS bottom bracket

I purchased EARLY this morning a Zipp Speed Weaponry 300 crankset from Bonktown (patience certainly paid off...!), and it requires an ISIS bottom bracket. Recently, I took off my Shimano 105 crankset and external bearings. So, from what I understand, if I'm putting the puzzle pieces together prope ... Read More »

ISIS bottom bracket tool help

I am chasing down a creak and ran in to a problem. According to Park Tool the BBT-2 (or 22) will fit all Octolink and ISIS bottom bracket. But, I can not get the wrench to fit. It seems as if the hollow spindle is too wide to fit inside the tool. Am I doing something wrong or do I need a differe ... Read More »

spacers w/ISIS bottom bracket

Hi there, hoping for a quick answer so I can go riding before dark, so I'll keep this short. Got a new entry level road bike at a great deal, but I'm on my own mechanically for it. When in the smallest chain ring, the chain rubbed on the large ring when using the three smallest cogs in the rear. ... Read More »

ISIS Bottom Bracket - Catastrophic Failure

I am putting together a Cross bike (SOMA). During a test spin last Sunday, the ISIS bottom bracket broke off at the left pedal, sending me to the pavement. Pictures are attached (of the BB that is). The bike and all the drive train components are brand new; everything had 10 miles or less on them. ... Read More »

Any reasonably good Isis lightweight bottom bracket ?

I got the American Classic and think it's a piece of junk. Brand new, I tighten it and it's not even turning regularly. Did I miss something ? Does anybody know of a reasonably good lightweight bottom bracket for ISIS ? PierreRead More »

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