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I'm considering getting a fairly cheap bike built up for track racing at my local club, reusing my old carbon tubular road wheels.

However, most track frames have a narrower hub spacing (120mm) versus road frames (130mm).

My options seem to be at present to stretch an old steel track frame to fit the road wheel, or to use a tri frame which should have the needed 130mm hub spacing.

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Any bike can be riden on the track but the question would be, does your tri frame have suitable drop outs for your fixed gear? Yes folks have rigged vert drop outs for fixed gear before but they usually are allot of hassle to keep setup just right. As far as angles for the frame go, a track bike is going to be really close to a tri bike for geometry but you ride what makes you feel comfortable. You could always just get your wheels re-laced with a narrower hub.

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I wouldn't. Track frames are purpose-built for racing at a velodrome.

Your tri frame will have a much lower bottom bracket. This can easily result in a pedal strike on the banked corners of the velodrome. Pedal strikes on corners with a fixed gear are bad; since the drivetrain is always turning, it will cause your rear wheel to jump perpendicular to the track surface. This will throw you into the bike on your left, and cause a spectacular crash.

Not as bad is that your frame has vertical dropouts instead of horizontal ones. Horizontal dropouts are made such that any loosening of your rear skewer bolts can only cause the wheel to move further into the dropouts. With vertical dropouts, any slip can potentially result in you losing your wheel.

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Bottom bracket won't be that far different. Tri bikes will sometimes use smaller wheels and that will lower the overall bike. However if wheel size is the same you shouldn,'t see a huge difference. Crank length will enter into it more if he likes to sit at the top. –  Chef Flambe Jan 19 '12 at 9:02
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