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 Post subject: h/bar size q
PostPosted: Wed Mar 16, 2011 5:34 pm 
Old School Grand Master

Joined: Sun Jun 27, 2010 9:37 am
Posts: 3976
right i thought i knew most stuff about bikes. just bought a new stem for the trials bike. nice onza one, big reach and rise as its a 20" mod bike. so stem turns up. try a 25.4mm bar. too small. right so ordered a lovely 31.8 megamo flattie. too big. wtf! what size is between 25.4 and 31.8 :?


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 Post subject:
PostPosted: Wed Mar 16, 2011 5:39 pm 
Gold Trader / rb Rider / Special
Gold Trader / rb Rider / Special
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Joined: Mon Aug 31, 2009 12:26 am
Posts: 16165
Location: Rurally close.
got any verniers about?
im not sure why but i have 28.8 in my head? :?

maybe try some motorbike handlebars if you got any about?


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PostPosted: Wed Mar 16, 2011 5:39 pm 
retrobike rider
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Joined: Sun Jan 09, 2011 4:47 pm
Posts: 1401
Location: Cheshire
In what way is to big the front plate and the stem shuldn't be touching when done up tight. Maybe 2-3mm of bolt between the two parts (rough estimation).

Maybe post a picture of how it dosen't fit.


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 Post subject:
PostPosted: Wed Mar 16, 2011 5:43 pm 
Old School Grand Master

Joined: Sun Jun 27, 2010 9:37 am
Posts: 3976
its a non removeable face plate. there is about a big gap around the 25.4 h/bar and the 31.8 doesn't get anyway near.

28.6 is motorbike sizing, but there is no way i'm forking 50 notes for a vegas bar for this heap :lol:


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 Post subject:
PostPosted: Wed Mar 16, 2011 8:43 pm 
Old School Grand Master
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Joined: Wed Feb 20, 2008 12:21 pm
Posts: 5785
Location: Lost in Translation
It'll be 28.6mm.

Onza used 28.6mm as a trials standard before 31.8mm bars came along. Alpinestars also used the standard in the early nineties:

http://i453.photobucket.com/albums/qq25 ... 0005-3.jpg

You can shim out a 1" bar, or look for a matching Onza bar.


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 Post subject:
PostPosted: Wed Mar 16, 2011 9:11 pm 
Old School Grand Master

Joined: Sun Jun 27, 2010 9:37 am
Posts: 3976
thanks for that. thought i was going mad :lol:

just ordered an aluminium seat post shim which should do the job.

thanks chaps, every day's a school day


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