So after 26 years my 1994 Specialized rigid mtb gave up the ghost. I was given that bike by my parents when I was 16 for being a good kid & because it was time to upgrade from my cheapo Huffy. I really enjoy the bike. So I am looking to get a similar style rigid bike. I thought about getting another one in the used market, but I like how these new bikes have disc brakes & improved gearing for uphill. Mines is a 3 x 7 with 27t being the largest in the back and 22t the smallest in the front. I am thinking 2 x 10 38/28 with a 38t in the back. I am told that 26in tires are out of style and that 27.5in x 2.5 is what's popular and more common in terms of tire size. So, I think I will want to go with that size as I'd be worried 29in tires might be too big coming from 26in tire bikes.