Our bike is a Supremo and is steel. Is it possible to weld the bracket to the frame for disc brakes? Will require $2,000 ish with the new hub, wheel, brake, welding, paint...

The other option is to sell this one - got it on Craigslist with only 1,000 miles, for a great price and can recoop my investment + a few. Then get a new bike with all the stuff from the factory.

Here are the arguments for the new bike:

1) 172.5 cranks to 175
2) better fit for me, a little longer top tube
3) disc brake on rear
4) little lighter bike
5) less money in my pocket

New bike will take 12 weeks to get. Ride this one in the mean time.

Don't get me wrong - the Supremo is an awesome machine and we are enjoying it immensly.

Decisions, decisions. The new bike -robusta with all the bells and whistles.