Tune AC 38 Bottom Bracket

4.29/5 (7 Reviews)

Product Description

Tune AC 38

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Reviews 1 - 7 (7 Reviews Total)

User Reviews

Overall Rating:1
Value Rating:1
Submitted by Markus a Racer from Germany

Date Reviewed: August 18, 2004

Strengths:    Light

Weaknesses:    Crank arms have play right from the start

Bottom Line:   
I am reviewing the Tune "Sixpack" BB (hex taper). It is similar to the AC38 (square taper). These BBs have one fixed bearing (inner ring is fixed on the axle) and one "loose" bearing (inner ring is gliding on the axle when BB shell is tightened). Unfortunately the inner ring of the "loose" bearing did not exactly fit the axle of my "Sixpack" BB, thus there was play between the bearing and the axle - leading to remarkable crank arm play. Same story with another "Sixpack" BB, so I conclude it is a general weakness.

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Duration Product Used:   Less than 1 month

Price Paid:    $220.00

Purchased At:   LBS

Similar Products Used:   Shimano BB-UN72, Shimano BB-M950, Shimano BB-M952

Bike Setup:   Hardtail, cranks: Tune Big Foot

Overall Rating:5
Value Rating:5
Submitted by Martijn landzaat a Cross Country Rider from H.I.Ambacht/Holland

Date Reviewed: April 29, 2004

Strengths:    Light, Durable, stiff and low maintanance

Weaknesses:    None

Bottom Line:   
This is an update of my previous post!
The Tune AC 38 BB is still going strong after one and a half years service in the Dutch mud, rain and other crap.
Took it out once to inspect but it still looked and feeled like new.
The bearings are smooth like new and very well shielded from water and debris.
I'm sure that I'm going to enjoy thes BB for many miles and years to come!

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Favorite Trail:   Portes du Soleil/Les Gets

Duration Product Used:   1 Year

Price Paid:    $122.00

Purchased At:   Tune over the internet

Similar Products Used:   Shimano BB-UN72 and Tune AC37(steel axle)

Bike Setup:   Cube Airwing Blackline, DT SSD210L, Fox Float 100RLC, XTR, XT 4-pot disc, Thomson, King ISO Disc/CX-ray/DT XR4.1d and lost more good stuff!

Overall Rating:5
Value Rating:5
Submitted by martijn landzaat a Cross Country Rider from H.I.Ambacht, Holland

Date Reviewed: December 27, 2002

Strengths:    Light, good reputation and superb finish

Weaknesses:    Some say price but you get what you pay for.

Bottom Line:   
Got my AC 38 bracket direct from Tune and tried to mount it with the standart 2-pin wrench, this didn't work verry well.
Had my dealer check the tread of my frame and ordered the special W2 bottom bracket tool from Tune.
Received it today and mounting was a breeze with this tool.
The tool as 6 in stead of 2 pins and is well made, almost a shame to use.
(I think i'm going to order another one just to look at:))
Mounted the bracket with copper paste and it looks and feels perfect!
I hope this bracket will last longer than the standard Shimano crap I used before, but looking at the reputation of this bracket that shouldn't be a problem for a long time!

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Favorite Trail:   Schoorl, Noord-Holland

Duration Product Used:   Less than 1 month

Price Paid:    $122.00

Purchased At:   Tune direct order by e-mail

Similar Products Used:   Shimano XT(BB-UN72), Shimano LX(BB-UN52)

Bike Setup:   Cube Airwing Blackline, XTR drivetrain, HS33 brakes, King/X618ceramic/X-Ray wheels and Thomson stem+post

Overall Rating:5
Value Rating:4
Submitted by Marcel Frenk a Cross Country Rider from Nijmegen, The Netherlands

Date Reviewed: February 9, 2001

Strengths:    One of the lightest TI bottom brackets, still built to last.

Weaknesses:    Bloody expensive, but none other. Maybe tune should make a splined set-up in the future.

Bottom Line:   
If you want light, stiff enough, serviceable and long lasting, this is the BB. Read the manual (in German) and install it accordingly.

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Favorite Trail:   Rijk van Nijmegen & Cristalp

Duration Product Used:   6 months

Purchased At:   Fietssport Vincent Ede

Similar Products Used:   Shimano XT, never had one that survived longer than 9 months (maybe because of the climate).

Bike Setup:   Specialized FSR-XC M4, lots of tune stuff, Rond-Magura Quake Air 70, SRAM 9.0 SL

Overall Rating:5
Value Rating:5
Submitted by Pascal NEPPER from Luxembourg

Date Reviewed: November 13, 2000

Bottom Line:   
I cleaned it and reinstalled it with copper grease and a bit of loctite, and now it doesn't creak any more, so 5 stars!

Expand full review >>

Favorite Trail:   street trials

Duration Product Used:   More than 3 years

Price Paid:    $125.00

Overall Rating:4
Value Rating:4
Submitted by Pascal NEPPER a Weekend Warrior from Luxembourg (Europe)

Date Reviewed: August 21, 2000

Strengths:    Light
STRONG ! It has long Ti screws. I broke several Ti Spindles between the bearing and the crank, those screws go deeper in the BB spindle, making it stronger.

Weaknesses:    They can't be tighten with a shimano BB tool
No conterbolts, so it slowly gets loose & creaks.
Not cheap !

Bottom Line:   
truly one of the best Ti BB. Stiffness/weight ratio excellent. Would be even better if compatible with shimano BB tool.
It creaks a bit, but I must admit trials is hard for the equipment.
Maybe I should consider to get a bombproof Shimano XT :-)

4 Chillis 'cos it's 95% perfect.

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Favorite Trail:   Street, trials.

Duration Product Used:   2 Years

Price Paid:    $125.00

Purchased At:   Hibike.de

Similar Products Used:   Syncros Ti, Streak'x Ti (French manufacturer), Shimano steel

Bike Setup:   Merlin Taïga 15" for trials, street, freestyle. XTR, Mavic, Race Face, Moots, ...

Overall Rating:5
Submitted by Marko a Cross-Country Rider from Zurich, Switzerland

Date Reviewed: August 12, 1999

Very light: 158 gramms for 113mm lenght.
Includes extra long ti fixing bolts. They reduce spindle flex.
3 sealed bearings also reduce flex.Very stiff for the weight.
Lasts long.

Absolutely none.

Bottom Line:   
Lightweight, quite stiff, long lasting!
The best one out there.
5 hot chilies!!!

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Favorite Trail:   

Duration Product Used:   
1 Year

Similar Products Used:   

Bike Setup:   
Breezer Lightning
Breezer Fork
Tune BB
Bike Tech Carbon Cranks (310 gramms)
Dt Hugi Wheelset, Revolution spokes.
XTR Derailleurs.
XTR Brakes.

Reviews 1 - 7 (7 Reviews Total)

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