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• #2
Your question is a bit odd.
I think your best bet is to use wiki followed by some google. en.m.wikipedia.org/wiki/Bicycle_frame
That should get you started.
Then in the event that your specific question isn't answered on here or else where on the Internet ask here.
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• #3
He's probably asking what each frame model is aimed for, which I thought the Mercian website have already explained it.
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• #4
If you phone them they are reasonably helpful.
Is there somewhere online that explain the difference between each frame type?
Sorry if this has been posted somewhere, but I can't seem to find the answer anywhere...