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Technical & Reference Section => Tech and Restoration => Topic started by: brass monkey! on June 28, 2007, 09:43 AM

Title: Stem Shafts Sizes ?
Post by: brass monkey! on June 28, 2007, 09:43 AM

can anyone enlighten me............................... :)


How many different size stem shafts are there ?

I have a Gold Sugino Stem, that I was going to stick on my Ripper, but it don't fit the LG Forks !?! However I tried my Tuf Neck and it fits fine, the Tufneck shaft is narrower than the Sugino,.......are there two sizes ? 7/8th's and 13/16th's ???

Please  help....., am I losing the plot ?  :-[

Matt

Title: Re: Stem Shafts Sizes ?
Post by: Stodgy on June 28, 2007, 12:27 PM

There are definately two sizes, but i've only just found this out.

I sold an SR stem on the bay and I had a question from a buyer asking if it was the skinnier size, sure enough it was, but it was marked in mm rather than inches.

Learn something new each day.

Title: Re: Stem Shafts Sizes ?
Post by: brass monkey! on June 28, 2007, 12:37 PM

Quote from: Stodgy on June 28, 2007, 12:27 PM

There are definately two sizes, but i've only just found this out.

I sold an SR stem on the bay and I had a question from a buyer asking if it was the skinnier size, sure enough it was, but it was marked in mm rather than inches.

Learn something new each day.

me too Dave..... :)

looks like i'm in the market for another stem now...... :(

Title: Re: Stem Shafts Sizes ?
Post by: bodamus on June 28, 2007, 12:50 PM

There are different size Stem shafts I had a Tuf Neck that was the narrower 13/16 and had to use a shim on it. Had an early Gold Suntour Stem that the shaft was too fat to fit my Kuwahara Forks aswell.

bodamus :)

Title: Re: Stem Shafts Sizes ?
Post by: SaMAlex on June 28, 2007, 12:58 PM

There are 2 main shafted stem sizes.

BMX (USA)          21.1mm
"MTB" (Euro?)    22.2mm

Most shafted BMX stems are 21.1mm but some BMX style stems are/were avalable in 22.2 (ie Sugino and SR).

Hope that helps.

Title: Re: Stem Shafts Sizes ?
Post by: brass monkey! on June 28, 2007, 02:50 PM

thanks Gents, I have learnt something today !  :)

Title: Re: Stem Shafts Sizes ?
Post by: animal on June 29, 2007, 05:11 PM

I to have had this problem, tuff neck stem was tight in landing gear forks but lose in my MRD forks, cut up a carling can and used in as a shim  :LolLolLolLol: Didn't realise there are different sizes, just thought MRD forks were a duff size as had the same problem bitd. Does that mean all stems come in a metric and imperial fitment?

Title: Re: Stem Shafts Sizes ?
Post by: login_user on July 05, 2007, 01:55 PM

Quote from: S&MAlex on June 28, 2007, 12:58 PM

There are 2 main shafted stem sizes.

BMX (USA)          21.1mm
"MTB" (Euro?)    22.2mm

Most shafted BMX stems are 21.1mm but some BMX style stems are/were avalable in 22.2 (ie Sugino and SR).

Hope that helps.

Fook  :tickedoff: i've got one of those bigger Sr stems and its fooking useless.  :rant: