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New School BMX 2004 - Now => New School Park, Street & Dirt => Topic started by: lk_97 on January 14, 2010, 07:11 PM

Title: usa bb size
Post by: lk_97 on January 14, 2010, 07:11 PM
Hi im looking for a cheap 3 peice crank and came across one, but it uses a 20mm spindle, would it fot a us bb?
Thanks.
Title: Re: usa bb size
Post by: HEYWOOD BMX on January 14, 2010, 08:41 PM
 Save a fiver...

 http://www.customriders.com/prodshow.asp?prodid=11051&cat=8&parent=1001&sid=3
Title: Re: usa bb size
Post by: magna13 on January 14, 2010, 10:43 PM
dont do it! nobody makes a 20mm sprocket! i found it impossible to find a 25T
Title: Re: usa bb size
Post by: HEYWOOD BMX on January 14, 2010, 11:01 PM
24/7 sprockets were 20mm.Trouble is with some 20mm spindle cranks is that not all of them taper to 19mm at the ends...ie older D20s
Title: Re: usa bb size
Post by: Gary72 on January 14, 2010, 11:09 PM
dont do it! nobody makes a 20mm sprocket! i found it impossible to find a 25T
My son is running one of those conversion kits, And he is using a 24t Profile sprocket.
Bearing number is 6004, Just do a search on ebay.
Title: Re: usa bb size
Post by: magna13 on January 14, 2010, 11:20 PM
anyone fancy buying some DMR Crisis cranks? :-\
Title: Re: usa bb size
Post by: TwoBobRob on January 15, 2010, 10:39 AM
dont do it! nobody makes a 20mm sprocket! i found it impossible to find a 25T
My son is running one of those conversion kits, And he is using a 24t Profile sprocket.
Bearing number is 6004, Just do a search on ebay.


A 6004 bearing is a virtually generic MX and trials wheel bearing - should be very cheap anywhere, but avoid buying chinese bearings.  British or Jap for decent quality.

Title: Re: usa bb size
Post by: madmike-bmx on January 15, 2010, 11:41 AM
mate i got some royals for sale ... with 19mm usa bb if u want em :)
Title: Re: usa bb size
Post by: fugazi on January 15, 2010, 11:49 AM
24/7 sprockets were 20mm.Trouble is with some 20mm spindle cranks is that not all of them taper to 19mm at the ends...ie older D20s

I've got some mid 90's fishbone 20mm cranks that, luckily are 19mm on the splines so no problems with sprockets.
Title: Re: usa bb size
Post by: kev-s on January 15, 2010, 11:55 AM
the d20 bottom bracket from custom riders is tapered to fit 19mm sprockets as i fited one from them to my neices bike a couple of months ago :daumenhoch:
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