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Very tough to tell what you had at this point. I can't recall yellow on any USA model Cannondale before 1991 besides the Omega MTB. It seems that we get a lot of questions about bikes that were sold in Europe that don't match any known catalog description. I would suggest that you track...

I haven't owned a tandem but might be able to look at a friend's. I would expect that the bottom bracket is a standard Shimano mounted in an eccentric. For example, in 1997 all the tandem models used Shimano BB-UN52 bottom brackets. It's likely that you just need a new BB. What year/model is...

You can send Brian a PM on the site or email him at: vintagecannondale@gmail.com

I didn't think of it before, but I would be interested in the RX100 as partial trade.

Silver but not polished. All three rings are steel so it's not the lightest. $60 shipped in a flat rate Priority bubble envelope or $65 in a medium flat rate box with the FSA box.

I'm guessing the nut was stuck in the two piece end. I can see how that would confuse you if you'd never had one apart. The one piece end can get corroded from sweat and fail. I'd put a bit of grease on it and the threaded rod.

I have several NOS four arm FSA Alpha Drive 22/32/44 cranksets if you don't care about the crank matching the vintage of the bike. I have 170 mm in square taper, ISIS, and FSA Power Drive styles. Some have bottom brackets but I would have to check and make sure they are for 68 mm shells...

Powder coat is usually pretty hard. I doubt if you would scratch it but you could cut a couple of discs of helicopter tape slightly larger than the boss diameter.

Has the powder coat closed the hole diameters so that the bosses no longer fit?

I know that I have a pair of M730 arms here but don't know about rings to go with them. Bike co-ops are great for parts like this. Perhaps you have one that's reasonably close by.

Your RX100 should have a 122.5 mm bottom bracket spindle. There were a few MTB cranks that used that length which should give closer to the gearing you want: DX MT60, LX M550, XT M730. There are many others that will require a bottom bracket swap. https://sheldonbrown.com/bbsize.html

I would have to check but I might have a NOS 32 or 34 Uniglide cog. Guessing that you would have to grind the rivet heads off your cassette to change the large cog, but it's easily done. Uniglide is circa 1990 and looks different from Hyperglide cogs but would work fine for a bail-out gear.

I'd like some rise on the stem as the frame is one size smaller than I'd prefer. I'd rather have black than silver but will consider all.

Do you have a 28 large cog now? SunRace makes an 11-34 7 speed cassette. Only $13 at Universal Cycles but they are out of stock right now. It's unfortunate that the bike doesn't have the Coda 22/32/42 crank that the catalog shows. Even with a 34 cog you won't have a low gear comparable to...

Nice looking bike. 56 cm?

Pretty sure a standard Shimano or Campagnolo guide would work.

Looks like a Cannondale to me. Post pictures of the bike and as many of the components as possible. I will try to figure out what year and model it is.

The bottom bracket will have the notched lock ring/pin holes in the cup with two flats on the other cup - or it will likely have a replacement bottom bracket with splines on the inside of both cups. Splined cup (sealed bearing) bottom brackets became the standard in the 1990s, and have been...

The paint bubbling and corrosion is usually because sweat collects in places where it can get under the paint (cable guides, water bottle bosses) and the salt goes to work on the aluminum. A good rinse every now and then will help in preventing corrosion. If you have significant bubbling you...

None of my touring bikes are newer than 1990, so have the Tange forks with the cast crown. It's possible that Cannondale sourced the tig welded forks from a supplier that didn't thread them. I would think that with a good light you could see whether the bosses are threaded. If not you could...