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PostPosted: Thu Oct 04, 2012 8:01 pm 
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Joined: Sun Aug 19, 2012 11:43 am
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Location: Melton Mowbray
Hi could i fit a modern rear mech Shimano or Campagnolo to the Harris Nottingham frame?
thanks
Neil

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PostPosted: Thu Oct 04, 2012 8:08 pm 
rider | rBoTM Winner
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Location: Wakefield, Yorkshire
Yes, threading should be the same.


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PostPosted: Fri Oct 05, 2012 12:53 am 
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But also... how modern? Modern as in: indexed to shift over (what are we up to now...11??) cogs?

Chances are those dropouts are 120mm OLN and won't take kindly to having a state of the art transmission jammed between them! That's almost certainly not the intention, but I mention it just in case..


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PostPosted: Fri Oct 05, 2012 2:34 pm 
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Joined: Wed Aug 01, 2012 9:39 pm
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Location: leicester
if its steel the rear chain stays can be pulled to the correct length for modern gears which is 130mm i had to do it to my bike


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PostPosted: Fri Oct 05, 2012 4:15 pm 
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Location: New Forest, UK
You can cold set 531 but not 753.


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PostPosted: Fri Oct 05, 2012 11:01 pm 
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Well...Yeah.
You can do that, but do you want to do that to 43-year-old 531? Which, if you look at the other pictures of this frame posted in another thread, is quite possibly corroded in precisely the area where the stress of this procedure is likely to accumulate.


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PostPosted: Sat Oct 06, 2012 5:35 am 
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My 1959 Carlton is 130mm. Not sure when it was done but it's been fine in my hands since accquired 6-7 yrs ago


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PostPosted: Sat Oct 06, 2012 9:19 pm 
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Well it seems my opinion is in the minority, and I admit that I may be projecting anxiety based on the fact that my oldest and favourite ride in my modest two-and-a-half steed stable has had two heart transplants (that's bottom bracket shell removal and replacement, for the literal-minded). These two heart transplants took place in two different cities two hundred miles apart. The second heart transplant was to rectify the damage caused by the first one, as far as that was possible. Coincidentally, chances are that the fella that did that second transplant is the same fella that built one of the frames in your stable, Tonyf39, but I don't know for sure.

That was back when there was no market in 'obsolete' bike bits, at least not one I was aware of, and when I asked for that second heart transplant, I reasoned that it would be a good opportunity to get the rear ends spread a bit, not because I wanted to, but because I despaired of ever finding a half-decent 5-speed block again. My rear ends were at 120mm (or should have been--after that first botched heart transplant it is anybody's guess). I wouldn't dare ask for 130mm--I even felt bad asking for 126. In the end they got it to about 123mm, and I wasn't going to quibble about the rest....Neither am I going to force anything between those dropouts that doesn't want to go. 123mm....This is how the frame was returned to me from someone who's just done a first-class job of replacing my bracket shell. Does that mean anything? Maybe not, but it could be evidence that you should assess the advisability of the procedure on a case-by-case basis without assuming that because it worked on some other steel frame it will work on any steel frame.

So, that's my story... with all the sordid details of the first transplant left out. I am slightly wiser from the experience. Hopefully that fella who botched the first transplant is now a more diligent frame repairer than he was back then. always in the back of my mind is the thought of my bracket which has been heated up to brazing temperature at least four times, probably six, and like I said, perhaps I project that anxiety onto situations where it is unnecessary.

But seriously, anybody, have a look at the picture of this Harris frame on the other thread, where you can see that there is no paint around the chainstay bridge, and possibly hasn't been for decades, and tell me you'd be happy to advise someone to yank those stays out to 130mm without even seeing the frame first-hand?

I'm very far from being an expert. And I'm not saying anyone is wrong. I am just advising caution. Maybe I'm just too cautious and you can pull those stays out to 145mm with a clear conscience. I would genuinely like to know...maybe the OP also would... What is the acceptable limit for this procedure? On old and possibly corroded 531? Alternatively perhaps those rear ends are already at 130mm- nobody knows except the OP!


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PostPosted: Sun Oct 07, 2012 10:03 pm 
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I think the actual measured OLN is 128.7mm but as per the pic below it's fitted with 8 speed DA wheels so 130mm and they slotted straight in no problem. I've changed it back to a 6 speed friction shift set up and added a small spacer to the axle
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