Originally Posted by bikemig

The differences likely depend on the year but the early 90s 750s had the same frame more or less as the 520 (which was Trek's top touring bike): the bikes had full chrome moly frames (double butted main triangle, chrome moly fork and rear triangle) and they were lugged in the early 90s. This is mine with a Brook B 17 saddle and trekking bars. I replaced pretty much everything but the headset, seatpost, and wheels are original.