New stem, bars & shifters on old Bridgestone 700 I recently bought a 1980's Bridgestone 700.  I have trouble feeling confident on this bike between the narrow drop bars and the downtube shifter. This is my all-steel commuter and I'd like to put either wider drop bars or possibly even flat bars on it.   The current bars are 25.5mm diameter (hope that's close enough to an inch) by 16 inches wide. The fork/ stem is 22.2mm diameter. My modern road &amp; mountain bike forks and stems make sense to me but this is a whole different era. I'm also thinking of changing the shifters. Everything is Shimano 600 currently.  My questions are:


Is there any way to get a modern stem with some rise in it on to this bike &amp; what parts will I need?
If I decide to add a more modern shifter/brake combo what should I look for to ensure that the new shifters work with my existing deraileurs?


Thanks!
you should be able to get a variety of 22.2mm quill stems. For instance SJS have a fair selection (picked because they came up first in a search for 22.2mm quill stem, I have no connection with them). 22.2 is a standard size and still common.
If it has indexed shifters you should have no problems, but Shimano 600 may not be indexed, and might be 6 speed. In which case you can look for thumbshifters with a friction mode or change the drivetrain. The cost of buying new 7 speed drivetrain parts is enough that I wouldn't suggest it - you'll spend a fair chunk of the cost a new cheap bike doing it. If there's a bike recycling group or tip shop in your area you should be able to avoid spending most of the money - old bikes with 7 speed indexed gears are pretty common.