Garth- I too have an '83 Stumpjumper Sport frame and a box full of the most of the original parts. I'm not sure what the tire clearance is like, but I have this neat old article from '83 as a reference http://www.vintagecrank.com/vintage-bicycle-articles/Fat-Tire-Bikes-Bicycle-Mag-May-83.pdf Looks like every bike test is running 2.125 tires. I also have a '87 MB-2 (one of Grant's first designs, the first was the '86 MB-1) that can only fit a fit a 1.9 tire. I was able to squeeze in some reproduction Panaracer Timbuk II 2.0 tires, but they are super tight fit between the chainstays. Jim and Ted- sounds like you guys have similiar issues on your early Bombadils (mine is a 52 BTW), so the problem is not just unique to my Bomba. I think you folks our right about the Bomba being designed at a time when the Schwalbe HS 315 "Fatty" (true size 45-47) was the biggest 650b tire readily available. I CAN get about 5mm of clearance between tire and bridge if I run the Quasi's at 25-28 psi, but the one time I ran them that low I got a pinch flat. I usually run 35 on pavement and then drop to 30 on rough trails. I would like to eventually upgrade to a tubeless setup. Mud clearance was a big issue this past season for both my Hillborne and Bomba. I used my Hillborne for the Dirty Kanza gravel grinder and ending up carrying it for 3 miles because the wheels kept getting stuck between the frame and sidepulls. I ended up wearing through the paint in a couple of spots when I finally was able to get the wheels unclogged enough to spin the clay-like mud was full of sand and pebbles. I was running 40.5 wide Fatty Rumpkins and had at least 10mm of clearance above the tires on the Hillborne. I may switch to Paul Racers and 38 mm tires this year on the Hillborne. Similiarly, our local single track trails in KC were closed most of June and July here in KC due to rain and when they were open, they were still sticky in dirt and slick on the rocks. I tried running the Schwalbe Fatties but could not get enough traction for climbing. I have been talking to Rick at D&D cycles about getting the Bomba repainted, but I don't want to wreck the new paint with tire rub. I am also considering trying to get the bridge raised 5mm. I just installed Bruce Gordon Rock n Roads and they have tons of room in the frame and the tanwalls look great on the Bomba. I am hoping the work well enough on our local trails. I use my Bomba as here in KC as my primary trail bike, as my full-suspension MTB currently lives at our vacation place in Colorado. Chad
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