hey, im trying to convert an old 10 speed into a fixie but ive come into a block at the back wheel. do i need a new hub with only one sprocket or can i still use the old one?
if you want it to be a true fixed gear you will need a new hub that has threading for a fixed gear cog and lock ring. If you’re just looking to make a single speed out of it you have two options. A: leave the original 5 speed freewheel on and just set the chain on the preferred gear. this is the recommended method for proper chain alignment. B: take off the 5 speed freewheel and install a single speed freewheel. this method looks better but chances are your chain alignment will be way off and will probably lead to your chain skipping and popping off, this can be corrected by having your axle re-aligned and re-dishing your wheel, probably by a pro mechanic. Either method used you should look into a chain tensioner like the Surly Singleator…you can also use your old derailleur, although it wont look as nice. If you decide on buying a fixed gear wheel for your ride you will want to get a half link chain to get proper chain tension since you don’t have the adjustability of track fork ends a.k.a. horizontal dropouts. There are also some useful tips on the late Sheldon Brown’s page here. Hope this helps. Cheers!