Hi Fred. I do a lot of single speed/fixie conversions here in Chicago. There's absolutely no need to file off the lip on the spider, especially since you'e likely to get a better chainline w/ your chainring on the inner position. Plus it's nice to have should you want to convert back at some point. You will need single chainring bolts available in steel from Bike Tools Etc. for about $6-$7.00 or alloy ones from Excel Sports International for a bit more than $10.00, i think. You may want to use an intermediate size chainring - 44-48, which may be hard to find in a Victory 135mm bcd. A 42/13 gives a decently high 87" gear. Good luck. Billy Ketchum; Chicago, IL; USA. P.S.: Are you looking for a clamp-on single lever or do you have braze-on bosses and just need the lever itself? ----- Original Message ----- From: saint09@bellsouth.net To: Classicrendezvous@bikelist.org Sent: Thursday, March 19, 2009 7:05:24 PM GMT -06:00 US/Canada Central Subject: [CR] Help! Okay guys and gals, this may seem like a stupid question, but I have an old Cilo bike that I wanted to dress up with a vintage "deco" style chainguard which means doing away with the front derailleur and going to single chainring crank. Is it possible to convert a double ring crank to a single or do I have to buy a single? Also I think I remember Campy made a single shift lever set at one time. This will be a five speed since I want to retain the old five cog freewheel. It's just a potential project so feel free to call me crazy or whatever, but I love the look of the chainguard and don't have the proper bike that I can use it on. The chainguard cost more than than what I paid for the bike. The Cilo pesently has Campy Victory components, vintage fenders, racks, and vintage French lights. It's all about appearance rather than authenticity. Fred Durrette Summerville, SC