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 Post subject: Will it work?
PostPosted: Mon Jun 10, 2013 10:13 pm 
Retro Guru

Joined: Tue Dec 04, 2012 7:44 pm
Posts: 301
Location: Durham
Hello again Retrowers. I have my eye on a Hope ti bb for my 95 P7. I have already been told it needs a 68 113. But I am wondering if 111mm will do the job? On Middleburn RS7s or will it be too short?
Thx Byron


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 Post subject: Re: Will it work?
PostPosted: Mon Jun 10, 2013 10:34 pm 
Retro Guru

Joined: Tue Dec 04, 2012 7:44 pm
Posts: 301
Location: Durham
viewtopic.php?f=1&t=233083


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 Post subject: Re: Will it work?
PostPosted: Tue Jun 11, 2013 7:58 am 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8202
Location: New Forest, UK
You are unlikely ever to notice the difference. I run an RS7 on a similar skinny steel frame with 110mm BB. If you have a top swing mech there might be insufficient space for it to engage (but it's unlikely).


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 Post subject: Re: Will it work?
PostPosted: Tue Jun 11, 2013 10:21 am 
Retro Guru

Joined: Tue Dec 04, 2012 7:44 pm
Posts: 301
Location: Durham
I'm fitting a M950 top pull 31.8. Was thinking if it is to short it wouldnt knock down into bottom ring.


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 Post subject: Re: Will it work?
PostPosted: Tue Jun 11, 2013 10:45 am 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8202
Location: New Forest, UK
It worked fine with a 28.6, top pull, bottom swing. In the end I think you just have to try it out!

My suspicion is that bottom swing mechs can put the cage slightly closer to the seat tube, but I've never bothered to measure it.


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 Post subject: Re: Will it work?
PostPosted: Tue Jun 11, 2013 11:14 am 
retrobike rider
retrobike rider
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Joined: Sun Feb 19, 2012 10:08 am
Posts: 6840
Location: Nth Somerset, UK
If there is any problem at all it will be with getting the chain onto the big ring.

However, if you are using a 31.8 bottom bracket and you place a shim on the opposite side to the chain rings, you will probably be able to get the whole thing to work.


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 Post subject: Re: Will it work?
PostPosted: Tue Jun 11, 2013 11:55 am 
Old School Grand Master

Joined: Tue Oct 09, 2007 1:55 pm
Posts: 8202
Location: New Forest, UK
NeilM wrote:
If there is any problem at all it will be with getting the chain onto the big ring.


Eh? :?
If it's a shorter BB (111) the big ring will be closer to the mech than the 113...

Puzzled.


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 Post subject: Re: Will it work?
PostPosted: Tue Jun 11, 2013 11:58 am 
retrobike rider
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Joined: Sun Feb 19, 2012 10:08 am
Posts: 6840
Location: Nth Somerset, UK
DOH!

You're right, I was thinking longer axle not shorter. :oops:


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 Post subject: Re: Will it work?
PostPosted: Tue Jun 11, 2013 12:02 pm 
Retro Guru

Joined: Tue Dec 04, 2012 7:44 pm
Posts: 301
Location: Durham
Yea al just try it. Its a Hope ti for £50 so could be an expensive trial, if the lad can get it removed from the frame for me!!!


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 Post subject: Re: Will it work?
PostPosted: Tue Jun 11, 2013 10:18 pm 
Retro Guru
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Joined: Thu Jul 26, 2012 1:31 pm
Posts: 2365
Location: The Cave of Shame
Bit pricey for a hope IMHO. On an average day you could get a Royce for that.


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