Joined: Sep 2009
Posts: 1,538
Likes: 2
From: Teenage Wasteland, USA
Bikes: '74 Raleigh LTD-3, '76 Motobecane Grand Jubile, '83 Fuji TSIII (customized commuter), '10 Mercier Kilo WT (fixed obsession), '83 Bianchi Alloro, '92 Bridgestone MB-1 (project), '83 Specialized Expedition (project), '79 Peugeot UO-8 (sold)
It's safe, but if you can't get good chain tension in the absence of a deraileur, you might have to go with a chain tensioner...which everybody on here might hate you for - but it would keep your crank attached to the cog.