Jem
Viscount
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Posts: 3,390 
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Post by Jem on May 28, 2014 9:32:24 GMT
I can't find the thread now where Velocepete and Stella discuss the downfalls of pulling a frame to fit in a set a wheels that are too wide. My point being, if I could find them, that I really want to get the right size.
But anyway, let me try and explain my issue.
I'm trying to get a nice classic pair of HF hubs with alloy rims for my 'Pro project. Trying to keep it fairly in keeping with original spec.
I seem to remember someone saying the frame is 110mm outside measure. (is this correct?) It's in the shed and it's raining heavy, so forgive my laziness.
And then the question is this , how do I, and from which points do I measure a pair of wheels that I might come across to see if they would fit?
And I mean, literally how would I measure them, bearing in mind I am 99% sure I wouldn't have my frame with me at the time.
Is there anywhere on here or on CTC a guide for what size wheels fit which frames?
Thanks in advance
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Post by velocipete on May 28, 2014 10:27:06 GMT
Jem, I assume you mean the axle width for the frame drop outs. From memory,the front forks are a standard 100mm.
The rear depends on the age of the frame to some extent. 5 speed can be 110mm to 115mm depending on the maker.
6 speed to 8 speed are usually 125mm -126mm. Modern frames are usually 130mm for multi speed road frames.
Anyway,I've just measured my Aerospace Sport. Front forks 100mm, rear forks 125mm.
The best way to measure the over lock nut dimension of wheels is with a digital verier gauge.These are quite cheap and
fit in the pocket for bike jumbles etc.
Hope this helps.
Cheers,
Pete.
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Post by Stella on May 28, 2014 11:00:11 GMT
I'd like to confirm Pete's post and also add some more. If I'm not mistaken, Viscounts are in general 126mm OLD (over locknut distance) at the rear. That is measured where the locknuts will meet the dropout (inside the frame). Then you have the QR skewers securing the wheel in place. Measuring the OLD: tighten the locknuts, so that the bearings will be moving freely, but with no play (cup & cone approach), if you go for sealed bearings, just tighten them down so there's no play in the spacers. Then, using a Vernier caliper, measure from outside locknut to locknnut as shown in the picture. Can be done with a ruler, too. This hub is a bit more, but I haven't tightened the whole thing properly. The threads are also a bit stiff. :-) You can always play with spacers or, if necessary, bend the frame a little (or forks) to make a hub fit. Don't try to bend a fork or frame in order to squeeze a hub in, rather do it beforehand so the axles slight in easy as it'll be less stress and fatigue on the frame. I had to bend the new Tange chrome forks as they came in 95mm. They happily take the 100mm front hubs. For the Pro, I'd suggest 100mm front and 126rear. If you find a 130, you can bend the frame, but be aware that it may cock up your chainline or the axle length as the chain stays will be wider and may meet with the crank set.  |
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Jem
Viscount
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Posts: 3,390
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Post by Jem on May 28, 2014 11:08:53 GMT
Thanks both for speedy reply.
So if I look for 100mm front, 125/6 mm rear then I won't be far out for an Aerospace Pro? And keep a gauge in my pocket for such occasions. Jolly good!
Thanks for pic Stella, very good stuff
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Post by Stella on May 28, 2014 11:18:23 GMT
You'll be perfect. But to be sure, measure the drop outs of the frame first. You never know what the previous owner did. The blue frame you gave me was bent to take a 130 OLD, most possibly to convert it to a fixie. Hence the sawn off derailleur hanger!  Oh, and I didn't mean to be patronising; it's just that I remember being given information and still not really knowing what to do exactly. Look up 'measuring ERD'. You hardly find a precise answer. Pictures tell a lot, though. |
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Jem
Viscount
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Posts: 3,390
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Post by Jem on May 28, 2014 12:03:36 GMT
Oh, and I didn't mean to be patronising; it's just that I remember being given information and still not really knowing what to do exactly. Look up 'measuring ERD'. You hardly find a precise answer. Pictures tell a lot, though. Not at all patronised Stella. I really did appreciate it ,as I need all the guidance I can get. So if you explain something and I ask again for clarification, and then you say "do I need to draw you a diagram?" sarcastically. then my answer will be 'yes please'  Cheers Jem |
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Post by Stella on May 28, 2014 13:49:58 GMT
LOL I would never do that. Just had this conversation yesterday. And ask Steve, who had to deal with me numpty, when I really didn't even know a freewheel from a cassette or what a hub is.
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