I noticed that single speed bikes are fairly popular in Toronto.
Question: Is it relatively easy to convert a 5 speed bike to a single speed bike by simply replacing the rear wheel and adjusting the chain?
A few things to consider:
- you want to figure out which front chain ring / rear cog combo is going to make you happy - pushing a big gear may look all manly, but is not super fun for lots of stops and starts and can be hard on the joints when braking; conversely, you may find you spin out a lot with a small gear. Find which gear you're comfortable in and try and keep the chain ring and cog teeth numbers similar when you set up a fixie. Read up on gear inches for more info.
- the concept of chainline is important (having a relatively straight chain). You can ghetto approximate by playing with bottom bracket and wheel hub axle lengths
- you can get a rear wheel built special for fixed that uses a hub that's threaded specially for fixed and has bigger flanges to deal with the stress of the setup, and the builder can dish the wheel to get a better chainline, or you can go ghetto and use a lockring and heavy duty locktite to keep the cog of your choice on a regular (freewheel) hub. This is cheaper, but I've had the cog break loose under heavy skip braking, and as a result had no way to stop...
- on the topic of braking, are you going to go no brakes? It's pure, but can you read traffic really well and are willing to accept the consequences when you can't?
- another thing to consider is chain length - you want to have a nice snug setup, and this is easier to accomplish the more horizontal your dropouts (the slots your rear wheel slides into on the frame) are. True track bikes have completely horizontal dropouts for this purpose, but you can approximate pretty well with sloping dropouts. The worst are vertical dropouts, with those you pretty much have to play around just with removing links to get the best chain tension compromise you can. You can just cut your existing chain down, or true track chains are beefier and much more solid.
- lastly, consider crank length - since you can't stop pedaling and coast around corners with your inside pedal up, it's smart to consider shorter cranks if you plan on cornering aggressively so you don't bottom out and crank vault. Not too much of an issue if you're converting a cruiser....
Bottom line is you can go really full bore in getting everything all trued up and tight, and it feels great when you're riding a setup like that, smooth, quiet, connected to the asphalt, but you can also ghettoproximate something to get a feel for it and have tons of fun figuring out if you want to shell out a bunch for a dedicated ride and then you still have a great bar commuting beater to fall back on... if I was starting out and curious , I'd keep the front chainring, find a track cog with gearing I want that's the right size and threading for my existing hub and lock it on (I could get someone to tack weld it on and reduce the anxiety of having it bust off, but I'd throw loctite and a lockring or smaller cog on anyways as well to increase the chance that it'll stay on - disclaimer, you've been warned that it may undo on you and if you have no brakes this is not good!!), adjust the chain, and giv'er.
I've been riding fixed for almost 20 years, and a lot of guys I ride w bemoan the hipsterization of what was once a niche, cult like style, but I think the new ease of getting parts, the decent beginner rigs for very reasonable prices, and all the cool personalized rides you see around town are great - enjoy your conversion if you go ahead with it!