Question re service from LBS

[Allan McVie]

Hi

I bought a new bike at the start of the year after a couple of months the bearing on the rear wheel
disintergrated the LBS that I got the bike from changed the wheel for me and swapped over the tyre
and cogs from the old wheel at the time everything appeared fine. At the weekend I had my first
puncture on the rear wheel, I had alot of problem removing the tyre to fix the punture. I then
spotted that the tyre was a 700c and that the wheel was marked 630.

is this ok?

Allan

[Pete Biggs]

Allan McVie wrote:
> I then spotted that the tyre was a 700c and that the wheel was marked 630.
>
> is this ok?

No! 630 is the larger old imperial size otherwise known as 27 inch. I'm surprised you managed to get
the tyre on at all! You need 27" tyres or 700c wheels.

~PB

[Pete Biggs]

> I'm surprised you managed to get the tyre on at all!

Correction: I'm surprised the bike shop staff managed to get it on. The sizes are so different that
I think you might be trolling.

~PB

[James Annan]

Pete Biggs wrote:
>>I'm surprised you managed to get the tyre on at all!
>
>
> Correction: I'm surprised the bike shop staff managed to get it on. The sizes are so different
> that I think you might be trolling.

But what else does the wheel say? Is it really possible that it is a 630mm rim, or perhaps more
likely that this is just a model number that happens to use this value. I can't recall seeing the
bead seat diameter marked on rims, but I haven't looked.

James

[Pete Biggs]

James Annan wrote:

> But what else does the wheel say? Is it really possible that it is a 630mm rim, or perhaps more
> likely that this is just a model number that happens to use this value.

Long shot but possible.

> I can't recall seeing the bead seat diameter marked on rims, but I haven't looked.

They are usually. I've got an on Rigida 27" rim which is marked "16 x 630".

~PB

[Pete Biggs]

> I've got an on Rigida 27" rim which is marked "16 x 630".
^ old

~PB

[Allan McVie]

Hi

Pete Biggs wrote:
>
> > I'm surprised you managed to get the tyre on at all!
> Correction: I'm surprised the bike shop staff managed to get it on. The sizes are so different
> that I think you might be trolling. ~PB

I wish I was trolling I might get a laugh out of the situation.

Further info

the wheel is stamped with the following some not that clear.

Schurmann Germany DIN 630 16 Tvp 6 1.1/2 1'

As I said I had alot of trouble removing the tyre finnally using the pair of cone spanners I
happened to have on me I had good motivation as I was a long way from home on a ride.

According to http://www.sheldonbrown.com/tire_sizing.html the ISO Bead seat Diameter of a 700C is
622mm and a 27xanything is 630mm so the difference is 8mm

Allan

[Helen Deborah V]

Thus spake Allan McVie <amv2f@ucdf.gla.ac.uk>

> Hi

> I bought a new bike at the start of the year after a couple of months the bearing on the rear
> wheel disintergrated the LBS that I got the bike from changed the wheel for me and swapped over
> the tyre and cogs from the old wheel at the time everything appeared fine. At the weekend I had my
> first puncture on the rear wheel, I had alot of problem removing the tyre to fix the punture. I
> then spotted that the tyre was a 700c and that the wheel was marked 630.

You can use 630 (ie 27") and 622 (700c) inner tubes interchangeably. You can't do the same with
outer tyres.

27 inch wheels are all but obsolete.

--
Helen D. Vecht: helenvecht@zetnet.co.uk Edgware.

[Dave Larrington]

Pete Biggs wrote:

> I'm surprised you managed to get the tyre on at all! You need 27" tyres or 700c wheels.

I'm further surprised that people are still selling new bikes with 630's...

Dave Larrington - http://www.legslarry.beerdrinkers.co.uk/
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Editor - British Human Power Club Newsletter
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[Johnb]

Helen Deborah Vecht wrote:

>
> 27 inch wheels are all but obsolete.

Rubbish - I've got loads in the garage ;-)

John B