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@gbj_tester
I'd be surprised if a lot of Keirin frames were 017, it's a super light tube set more suited to lightweight climbers than burly sprinters. I had a TT bike in 017 back in the 80s, my Hirame road racing frame is 022. For track sprinting, I think 024 would be the first choice, maybe 025 for bigger riders.
See http://www.equusbicycle.com/bike/ishiwata/catalog2/