—A newer commuter
Newer, you wound me! Experts agree that paint color is of foremost importance. As my wife says, "Red is fast." What more do you need to know?
Oh, all right. Here are what I think of as "benefits" of a good used commuter bike that's fun to ride, and from there maybe I can backtrack to "features":
- Easy to carry onto bus racks and MAX
- Brakes work well even when wet
- Your feet stay on the pedals even when wet
- Lots of room to mount wider-than-racing tires and full fenders (for the wet)
- Has enough of a gear range for the places you're likely to go
That leads to these features:
• A sturdy but light frame made of a high grade of steel known generically as 4130 chromoly (manganese-moly is good too), with brands such as Reynolds, Columbus, Tange, Ishiwata, True Temper, etc.
Most better bikes will have a sticker somewhere on the frame that describes the frame material. If the sticker doesn't list the aforementioned brands or generic type, the frame likely is a lower grade of steel—still sturdy but not so light. Of course there are frames of aluminum, carbon fiber, etc., but most used ones will be wannabe racing bikes that can't fit wider tires or full fenders--so they're not so useful when rainy season hits.
• Wheels with rims made of aluminum alloy—because steel rims lose most of their braking ability when wet. Better yet (but rare), disc or drum brakes that aren't affected at all by the wet.
• Pedals that have foot retention such as toe clips and straps and/or grabby metal teeth or pegs and/or a receptacle for the cleats that adorn cycling-specific shoes (with the cleat and receptacle acting kind of like a ski boot and binding)
• An appropriate drivetrain. For your commute, with that short but steep wall at about 39th Street, you could get by with "average" road-bike gearing—but the extra low gears derived from a third chainring (as with 18, 21, 24, or 27-speed bikes) would be welcome.
Unfortunately, some bikes matching this description could be 20 years old or more. You should watch for the following predictable funkiness:
• The spokes—particularly those of the rear wheel—may be near the end of their life span, so you may get a broken spoke every other week or so. When a spoke breaks, the wheel gets wobbly and rubs on the brakes, which is a pain. Consider having the rear wheel re-spoked or replaced as a preventative measure, if it hasn't been done already.
• The chain and the smallest two or three of the cogs it meshes with may well be worn and in need of replacement. Such wear can lead to the chain skipping and causing you to stumble at the worst times—like in the middle of an intersection. Again, consider replacing them it hasn't already been done.