steerer tube and handlebar size

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mkviken
Posts: 182
Joined: Fri Jul 20, 2012 21:15 pm

steerer tube and handlebar size

Postby mkviken » Mon Dec 10, 2012 18:27 pm

are standard size for road bars and fork steerer tube both 31.8mm?

im looking at a new stem but ive seen 28.6mm ones too

im pretty sure my bike will be a standard size.

thanks

DesWeller
Posts: 5233
Joined: Mon May 05, 2008 15:36 pm

Re: steerer tube and handlebar size

Postby DesWeller » Mon Dec 10, 2012 19:26 pm

The old standard was 25.4.

The current most common size is 31.8.

If you're unsure then measure your bars.

andrew_s
Posts: 2508
Joined: Sat Dec 07, 2002 22:01 pm

Re: steerer tube and handlebar size

Postby andrew_s » Mon Dec 10, 2012 21:20 pm

It will depend on how old the bike is.

The old road bar size is 26mm (previously 25.8-26.3 depending on brand). They are now mostly changed to 31.8.
Flat bars were 25.4 and are now mostly changed to 31.8.

The steerer tube used to be 1" (25.4), but most forks are now 1 1/8" (28.6). Aluminium or carbon forks are almost certainly 28.6, but steel forks may be either.


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