A 1977 mountain bike made by Ritchey of any wheel size would rewrite history because it implies that Ritchey and not Joe Breeze made the first custom built mountain bike. It is therefore an unsubstantiated claim to have invented the mountain bike.
Here's the testimony of Charlie Kelly:
"If there was a 650B version of our bikes prior to 1979, I'm pretty sure I would have heard about it".
Rewriting Mountain Bike History? - Page 3 | Retrobike
And this from Bill Savage alias clunkerbill on the first page of the same thread:
"This bike made quite a splash at InterBike this year. It was confusing, because it gave the distinct impression of being a historic bike built in 1977. This bike was obviously displayed to stake historic claim on the current 65B craze. That was Professor J.F. Scott's (RIP) deal. The text accompanying the bike was quite vague, and for good reason. It was not built in 1977, but Tom now says he definitely built one just like it back in '77 and this is a replica of that bike, though none of the parts on this bike were available before 1980. Confused yet? This bike was probably built in the early(ish) 1980s as a special order. Some bikes of that size were definitely built in the '80s by TR and this is one of them. Not one person I ever spoke to actually saw the original phantom '77 650B bike back then. As you might imagine, if they had that would have been BIG NEWS! It never once came up in my research or in my countless hours of conversations with Tom, Joe, Gary, J.F. Scott (RIP) and everyone else who was around back then. The way I heard it, Tom told Joe he 'was planning on making a 650B bike' when Joe finally showed him Breezer #1. That meeting with Tom didn't take place until January of 1979. Joe had been racing that bike for more than a year by the time Tom even saw it. Seeing Joe's bike Tom realized the higher volume of the readily available 2.125 rubber was clearly the way to go on rugged terrain. In the end it matters not. Legends all."
And another anonymous quote from a BB?
"As someone that was part of the early Norcal mountainbike scene I can confirm that many of us were playing with 650b Hakkepelitta's early on before the Cycle Pro Snakebelly made 26″ the size of choice. IIRC Gary Fisher showed up at the 81 Cross Natz on a Ritchey 650b bike and Jim Merz was also making bikes in this format at the time. Over at Fulton Street Cyclery they were selling Jack Taylor Rough Stuff bikes also using 650b. I hung on to mine until 87 before finally punting it."
Gary Boulanger of Dirt Rag/Bicycle Times magazine who currently resides in the Bay area and is in contact with many of the early players in mountain biking. Gary writes, "Regarding the so-called '77 Ritchey 650B bike on display at Interbike, "according to Joe Breeze and a few others, the frame set was actually built in 1980, most of the components were from 1985 or so, and the bike was originally built with drop bars. It was a touring bike; a nice one, but not a mountain bike, as Tom suggests, and certainly not in 1977."
But a tour has spice | gypsy by trade