Singlespeed & Fixed Gear - Vertical dropout conversion
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After reading Sheldon's site on SS conversions, I would like to convert a vertical dropout frame to SS/FG via the ENO. Am I correct that the parts to purchase should be the ENO hub, a freewheel (WI), and a fixed cog? If I'm currently running a double chainring, do I just use the outer ring, ditch the inner, and use spacers to take up the slack? Lastly, does the DOS ENO allow one ring to be fixed, with the other one being freewheel? Thanks for the SS newb help.
05-23-08, 02:33 PM
for the chainring, most people use their desired ring on the inside spot, it will probably give you the right chainline. if you want the outer ring, move it to the inside, and get some 5 dollar bmx chainring bolts.
05-23-08, 05:31 PM
the eno hub is just an eccentric hub that gives you some extra leeway when finding the proper chain tension
05-23-08, 05:40 PM
The chainline for an ENO hub is 47.5 mm, which, as you read on Sheldon's site, is close to the outer ring on a road double. I use an ENO hub with a standard Shimano Octalink double bottom bracket, Shimano 105 cranks, and the chainring in the outer position. The chainline is very close to perfect with both a White freewheel and a track cog. I use single stack chainring bolts rather than spacers.
The ENO hub is fixed/free - one side is threaded for a freewheel, and the other for a track cog and lockring.
The two cogs on the DOS ENO freewheel machined in place and not independent of one another.
The eccentric ENO hub generally doesn't have the same range of adjustment as a bike with track ends. When the eccentric is in the "12 o'clock" position, your rear tire may hit the brake bridge. In the more forward position (about 2-3 o'clock), the chain may be too tight.
Be prepared to experiment with different cogs and chainrings until you get it just right. I've found more range of adjustment with smaller cogs/freewheels and chainrings, for example, 44 x 15-16-17 vs. 54 x 21-22.
The hub is great - I have a couple!
05-23-08, 07:13 PM
If its a cheap frame just use this... http://www.dkimages.com/discover/previews/999/70025064.JPG
Thanks for the input. I won't file it as it's a litespeed frame.
05-23-08, 09:22 PM
You can file a flat area on the axle to get a little adjustability. I wouldn't do it on anything more expensive than a formula hub though. Just so you know. You don't always have to buy an ENO hub. You'll probably have to play with chainring/cog sizes a bit but it helps you get the chain tension just right instead of "Eh it works"
I heartily recommend the ENO hub. Harris Cyclery built me a set of 3x open pro wheels with ENO rear and a Harris Cyclery brand high flange hub in front. It's easy to use and adjust. I run 48x19 ss and 48x18 fixed. You can't go wrong with ENO.
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