Originally Posted by Gummee!
Supposed to be the newest, bestest thing that's been re-discovered after being lost. First mtn bikes ever were evidently 650B bikes.
We sure didn't have any 650B stuff up on Mt Tamalpais in the early 1970s. All we had 26" fat tire, (hey, it was that or road bikes, with 27", or tubulars).
I had a couple 26" old gaspipe steel cruisers, some folks converted these with 5-speeds, but more frequently they were 1-speed with coaster brakes. Pretty soon loons like Ritchey were making their own 26" monsters, lighter, stronger, with gears and actual brakes. I never could afford anything like that.