Maybe this should be in its own thread, but here are some pics and info about the Bridgestone 450 650b conversion. I hope they help.
The 450 rides great with the 650b's. I used Riv stock Velocity wheels. At first I attempted to use Schwalbe Marathons on them, but I couldn't fit them plus fenders. I think even without fenders there was barely any clearance.
But with Nifty Swifty's (about 32mm), there is a tight but totally safe amount of clearance (I'd say just under a cm) near the brake between those and the SKS 45mm fenders I'm using. I mentioned earlier in the thread that Col de la Vie's might work as well... but I've never tried it. This conversion was worth it for me, not only for just a little extra tire size, but mostly for the ability to put real fenders on the bike. There was absolutely no clearance for real fenders with the 700c x 28 setup original to the bike. Now I can commute after (or while) it rains without nasty city water getting on me.
This move, plus putting the Bosco bars and bringing the shifters up to the bars in the inside position (the Sun Race one-at-a-time's), changed cycling for me. Riding in this relaxed position makes me feel so good.
I'm not sure about the size and year of your 450 but mine is a 54cm 1987 and this worked fine. Oh, and, you'll need to use Tektro r559 brakes to reach the 650bs. I regrettably used these Shimanos that didn't actually fit; I had to file out the brake pad channel so that they'd get an extra couple mm of reach... I don't recommend this because it actually voids the warrantee of the brakes.
Before anyone criticizes me for the big kryptonite cable slung around my VO saddle and through my rack, this is because its my commuting bike and I live in New York. If I don't do this I can basically say goodbye to my saddle.
Anyway, I'm glad I took a second to take these pics for you because within a week most of my upgrades will be migrated over to the T700 I found in the trash, and this bike I'll probably build back up with it's original parts I saved (except the wheels).




