Never even thought of spreading chain stays like that, wonder if it'd work on my ally frame? Then I could get the 26x3 Kendal flames that are calling me on eBay :-(
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I'd do a bit of research/questioning before I tried this on an alloy frame Uncle Fide. It's been 30 years since I did metallurgy at college, and never really worked with aluminium in my trade, but I've heard some horror stories about people trying to cold set alloy frames.