American Classic ISIS Bottom Bracket Bottom Bracket

2/5 (3 Reviews)

Product Description

American Classic’s ISIS bottom bracket is light because of the unique split ring design (patent applied). The new and improved split ring and cups support the bearings and keep them in place. The steel bottom bracket axle is designed to distribute the stress loads applied when riding. Replaceable stainless steel bearings are standard.

Also available with chrome steel bearings by special order for OE use only. Smooth ride feel. A proven design.

WEIGHT 108mm 140 gr 113mm (68mm/73mm) 153 gr 118mm (68mm/73mm) 157 gr BEARINGS 6804 Modified Stainless Steel TOOLS NEEDED Truvativ X-Tool or Park BBT-8, Torque Wrench TORQUE SPEC 25-30 Foot Pounds each side. 15mm Steel Crank Bolts are not included

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

Reviews 1 - 3 (3 Reviews Total)

User Reviews

Overall Rating:1
Value Rating:1
Submitted by CB2 a Racer from West Hartford, CT, USA

Date Reviewed: December 28, 2009

Strengths:    Light

Weaknesses:    Self destructs

Bottom Line:   
I bought it for it's light weight, and replace-able bearings, but replace-able bearings are of no use when the installed bearing self destructs, and shears the bottom bracket fixing cup flange off in the shell. Expensive lesson.

Expand full review >>

Duration Product Used:   6 months

Price Paid:    $100.00

Purchased At:   CBO

Similar Products Used:   FSA,

Bike Setup:   Singular Swift, Raceface Turbine LP ISIS cranks

Overall Rating:4
Value Rating:4
Submitted by funnytanlines a Cross Country Rider from philippines

Date Reviewed: December 3, 2008

Strengths:    light weight (around 145g for road, 160g for mtb)

Weaknesses:    none yet. possibly breaings in the future but so far so good.

Bottom Line:   
got it for the weight savings. the amclass isis bb is 50-100g lighter then most other isis bb's. my road set up weighs less then most higher end cranksets with integrated bb's at half the cost.

Expand full review >>

Duration Product Used:   6 months

Price Paid:    $50.00

Similar Products Used:   truvativ sl, truvativ gigapipe, fsa ultimax

Bike Setup:   mtb: single speed, using truvativ firex crank
road: fsa carbon caompact crank + ultegra/dura ace

Overall Rating:1
Value Rating:1
Submitted by kester stancer a Weekend Warrior from sheffield uk

Date Reviewed: March 26, 2007

Strengths:    light weight

Weaknesses:    very noisy

Bottom Line:   
this bb might be light but the cups creaked,the axel/crank interface was too tight,the bearings were so notchy you could actually count the number of bearings by feel!
absolutely awful.then after about 6 months,the bearings came off whilst fitting.went straight in bin.most expensive truvative bb tool ever(came supplied with bb)

Expand full review >>

Favorite Trail:   green drive

Duration Product Used:   6 months

Price Paid:    $100.00

Purchased At:   super cycles

Similar Products Used:   fsa platinum ti

Bike Setup:   haro ex1,am3,xtr,magura,fsa

Reviews 1 - 3 (3 Reviews Total)

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

Isis bottom bracket

Anyone use an isis type bottom bracket that lasts on a SS? The last FSA bb that I bought is only 6 months old and already the bearings are not very smooth-although the FSA I used before this one has lasted a long time. Maybe just some variances in the FSA bottom brackets. Any advice?Read More »

Isis bottom bracket overhaul

So I pulled this bottom bracket out of a frame I recently bought. I think its been in there a while, my guess years. It seems alright though, still spins, but it is a little rough. If I can I definately want to salvage it cause I'm on a tight budget with a DH build I'm doing. So I want to over haul ... Read More »

ISIS bottom bracket

Seems I need a new isis bottom bracket..Would like something durable over something lightweight that isnt gonna last over a season..Read More »

Durable ISIS bottom bracket

Seems my isis bottom bracket is creaking and groaning louder then my old knees.. What kind are you using??Read More »

Help finding an FSA 100mm ISIS bottom bracket

Does anyone know if the FSA ISIS bb 100x148mm is in stock anywhere? I can't find one online. The Truvativ version seems to be available, but I'd prefer the FSA. ThanksRead More »

Read More »




Interbike Featured Booths

Check out the hottest mountain bike products from these brands!

See All Interbike Coverage - Click Here »


MTBR on Facebook