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I can't see why this won't work, are your 105's 9 speed, the front(left) shifters won't be a problem 3=3=3 but if the sti are 10 speed you will have an extra click for the rear? (I assume), also don't be in a hurry to dismiss the sora they may not be shimano's top end but in my experience they've always worked brillantly.
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S. Speed wheels (271/4) £20
Atlanta 96 on Shimano hubs 8 Speed new HG freehub fitted £50 (cassette not included but may have a spare)
British Eagle F&F 62cm with new Headset £25
Carlton Cobra frame (23 1/2") £5
all frames without forks £5 each
Blue frame 58cm
Carrera 54cm
The blue Carlton with metal badge has slightly damaged BB threads you can use a threadless BB, much better paint on this £5 -
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Any idea of what time you talking or if local can I drop off perhaps cheers k