Is it possible to make a frame a bigger size?

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This could result in a monster and expensive undertaking. I normally ride a 22" ST X 23" TT. I've converted a couple of 20"/21" frames to comfortable riders by using a longer stem, wider or different bars and a longer MTB seat post with a big setback. Increasing the wheel diameter will raise the bottom bracket, but won't affect the fit. You can probably find period correct stem and bars, but the seat post could be an issue if you wanted it to look perfect.

Cheers and good luck,

Van
 
There's a couple of 501 larger framed bikes on the bay for that sort of dosh and one I saw that seller thought might be a 531! I'll see if I can find it
 
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