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PostPosted: Wed Jun 30, 2010 8:32 pm 
retrobike rider
retrobike rider

Joined: Fri Jan 29, 2010 11:57 am
Posts: 308
Location: Devon
Hi, what diameter band on front mech do I need for a 80's 531 frame. been checking out ebay for a cheapy but there are a few different sizes on offer.
Help greatly received.


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PostPosted: Wed Jun 30, 2010 9:03 pm 
retrobike rider
retrobike rider

Joined: Sat May 29, 2010 3:44 pm
Posts: 1508
Location: Leeds
my 1989 531competition is 28.8

hth


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PostPosted: Sun Jul 04, 2010 7:43 pm 
Retro Guru

Joined: Mon Feb 01, 2010 8:57 pm
Posts: 774
FWIW there are only 3 standard sizes of clamp-on mechs - 28.6, 31.8 and 34.9. Steel frames all take 28.6mm IME.


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PostPosted: Mon Jul 05, 2010 6:16 pm 
Retro Guru

Joined: Sun Dec 14, 2008 2:11 pm
Posts: 303
The curse of the internet forum is that people will ask a question on a forum rather than simply finding out for themseles. How hard is it to find out the diameter of a tube? All you need do is measure the circumference with a tape measure or a bit of paper and a ruler and divide by pi. Rocket science it ain't.

Bah Humbug!


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PostPosted: Mon Jul 05, 2010 8:13 pm 
retrobike rider
retrobike rider

Joined: Sat May 29, 2010 3:44 pm
Posts: 1508
Location: Leeds
monty dog wrote:
FWIW there are only 3 standard sizes of clamp-on mechs - 28.6, 31.8 and 34.9. Steel frames all take 28.6mm IME.


0.1mm of paint on mine then, couldn't have measured that with a tape and pie :)


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PostPosted: Mon Jul 05, 2010 9:57 pm 
Retro Guru

Joined: Sun Dec 14, 2008 2:11 pm
Posts: 303
Ever noticed how a band on mech never closes fully?


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PostPosted: Thu Jul 08, 2010 9:51 am 
retrobike rider
retrobike rider

Joined: Fri Jan 29, 2010 11:57 am
Posts: 308
Location: Devon
The curse of the internet forum eh. well sorry I asked such a dumb question.
I thought that sites like these were full of folk happy to help. I for one am happy to ask questions, and to reply to others if I know the answer.
I'll stop using the site, won't bother to try and post a picture of any of my steads, cos what's the point. Somebody will be upset coz my Raleighs aren't Colnagos.
Bye Bye cruel Retrobike :cry:


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PostPosted: Thu Jul 08, 2010 3:29 pm 
Old School Grand Master
User avatar

Joined: Wed Feb 20, 2008 12:21 pm
Posts: 5785
Location: Lost in Translation
kula wrote:
I'll stop using the site, won't bother to try and post a picture of any of my steads

Aaaaaagh!

http://www.retrobike.co.uk/forum/viewto ... 5&start=13

Seriously though, if you really want to be useful, stick around and be useful. But for Pete's sake, grow an epidermis.

On the other hand, if you want to throw a Harry on us...

monty dog wrote:
FWIW there are only 3 standard sizes of clamp-on mechs - 28.6, 31.8 and 34.9. Steel frames all take 28.6mm IME.

Most do, but there are quite a few exceptions. I've got a later 853 Raleigh, for example, that takes a 31.8


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PostPosted: Thu Jul 08, 2010 6:45 pm 
Retro Guru

Joined: Mon Feb 01, 2010 8:57 pm
Posts: 774
Oops - I should have qualified that - for a steel frame, if the seatpost is smaller than 27.2mm then it's 28.6!


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PostPosted: Thu Jul 08, 2010 8:04 pm 
Retro Guru

Joined: Sun Dec 14, 2008 2:11 pm
Posts: 303
monty dog wrote:
Oops - I should have qualified that - for a steel frame, if the seatpost is smaller than 27.2mm then it's 28.6!


Except when it's not. I used to have a strange unidentified bike with a seat tube that was 27.2mm. IIRC the seat post was 25.4mm. I think the bike was French which explains (if not excuses) almost anything.


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