slowandfast
slow&fast
Well, the difference from an RS to an RT is might not a very obvious one. But after one notices the difference, one can't un-see it.
The lower parts of the fairing of both RS and RT are identical. However the upper parts are quite different. The upper swoop of the RT is at a diagonal and the mirror is mounted on a very different shaped bracket. Most characteristically the RT has an air-intake below the turn signal indicator whereas the RS has no air intake in the upper part of the fairing. Last but not least the RT has a much taller clear windshield.
The image for comparison is from Bill Stermer's book: BMW R100RS and shows a detail of a first year (1977) BMW R100RS page 23.
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