I have a 2100 Trek road bike that is 19 years old. It's still in great condition, but I no longer ride it because I have a much newer road bike. Is it much work/money to convert it to SS? What do I have to do? It seems silly to buy a new bike when I have this bike that despite its age is in excellent condition.

The bare minimum you need to convert a road bike to a SS/FG is a new rear wheel complete with a SS hub and cog/lockring or freewheel. You will probably also need a new chain and crankset.

There is a little thing called Google btw:

https://sheldonbrown.com/fixed-conversion.html

https://www.bikeforums.net/showthread...eed-Start-Here!

if it's a cassette rear hub, you won't need a new wheel. it is not much work at all, just take off the old derailleurs, shifters, cables. Then, you can shorten the chain, take one of your front chainrings off. If you have a cassette rear hub, you can reuse one of the cogs and put it back together with spacers. If not, you can attempt to thread a singlespeed (bmx) freewheel onto the hub, but your chainline may be off. If you don't mind dropping a chain here and there, not that big of a deal. Sometimes you can use a multi-speed chain with poor chainline because they are able to run at some extreme angles, but you may still drop the chain. If you want to be truly ghetto, you can simply use your freewheel as is, and just run the chain around one of the cogs of the cluster, but the look is not the best.

NO! This is 100% wrong. If you want you bike to be fixed gear without running a suicide hub you need a new rear wheel, or a Surly Fixxer for a cassette hub. You don't need a new chain if you get a 3/32" cog and you definitely don't need a new crankset.

Now, since your bike has vertical dropouts your choices are a little bit more limited (this is one of the carbon tube Treks, yes?) You can either run the bike single speed with a chain tensioner and your current wheel, or you can run it as single speed or fixed gear without a tensioner by finding the "magic ratio". This is the ratio that gives you perfect chain tension where the wheel sits, because you cannot move it in the dropouts. It can be a pain to find but is certainly not impossible. I've done it on 3 bikes now.

In good shape your 2100 is probably still worth about $300 on craigslist. If you're not attached to this bike consider selling it for one more suited to FG/SS. Maybe sell it to me I like those bikes quite a bit.

My bad. When I said "SS hub" I really meant a track hub. You are correct, a new crankset and chain won't be needed.

Thanks. Haven't decided what to do yet, but I might just keep the bike and buy a a single speed from bike's direct for $300. The trek rides as well as it did when I bought it, and even though I don't ride it much, I realize that I like to see it hanging there in the garage. Thanks again for the info everyone.

I just got one of these to simplify a conversion https://www.amazon.com/Dimension-Coas...4549502&sr=8-1 doesn't help if your going to fixed but still.