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 Post subject: 25-630 tyres?
PostPosted: Sun Sep 02, 2018 3:52 pm 
Devout Dirtbag

Joined: Wed Jul 20, 2016 10:27 am
Posts: 146
Though I can get 27" x 1" tyres will 27 x 1 1/8 tyres also fit on a 25-630 rim?


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 Post subject: Re: 25-630 tyres?
PostPosted: Sun Sep 02, 2018 3:59 pm 
Old School Grand Master

Joined: Mon Feb 11, 2008 9:42 am
Posts: 3163
As long as the etrto number (630) matches. The imperial size, thats anyones guess.

(Made more complex as i can find various 27x1 1/8 listed as both 630 and 622......)

Best option is to check the manufacturers site for accurate sizing.
Like this.
https://www.continental-tires.com/bicyc ... tra-sport2

The ultra sport 2 27x1 1/8 is a 630 tyre and will fit.


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 Post subject: Re: 25-630 tyres?
PostPosted: Mon Sep 03, 2018 7:00 am 
Devout Dirtbag

Joined: Wed Jul 20, 2016 10:27 am
Posts: 146
mattr wrote:
As long as the etrto number (630) matches. The imperial size, thats anyones guess.

(Made more complex as i can find various 27x1 1/8 listed as both 630 and 622......)

Best option is to check the manufacturers site for accurate sizing.
Like this.
https://www.continental-tires.com/bicyc ... tra-sport2

The ultra sport 2 27x1 1/8 is a 630 tyre and will fit.



Thanks,this size of wheel is new to me,but I would like it with as wide a tyre as the rim will accept.It's a replacement front wheel the rear wheel is 27 x 1 1/4,so I'd like to keep them as closely matched as possible.


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 Post subject: Re: 25-630 tyres?
PostPosted: Mon Sep 03, 2018 5:43 pm 
Devout Dirtbag

Joined: Wed Jul 20, 2016 10:27 am
Posts: 146
After a little more research and a few moments with a ruler I discovered the rim I have is actually 20-630 ie 27 x 3/4.The internal rim width being around 15mm,which appeared to me to be too narrow to accept even a 27 x 1 1/8 tyre.

Fortunately,I then came across Sheldon Brown's rim,tyre compatibility chart,

https://www.sheldonbrown.com/tire-sizing.html

showing actually that a 20-630 rim will accept even a 27 x 1 1/4 32-630 tyre,which in fact it does and very comfortably,as I fitted one this afternoon.

What a pleasant surprise!


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