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Join Date: Nov 2007
Location: Chandler, Arizona
Actually with the Vulcan's stock geometry, you can get away with lowering the rear only, you may notice the steering gets a little heavier, and the front end tends to fall into turns. Many bikes have more rake than the Vulcan, and by lowering the rear just a little, all you are doing is increasing the rake slightly. The trail will remain almost unchanged. The bike will actually be a little more stable going straight. Just don't do the opposite, and lower the front only. That will decrease the rake, and drastically alter the trail, resulting in a bike that is unstable at all speeds.
Another thing to remember is ground clearance. The stock Vulcan already doesn't have very much (I drag the pegs on a regular basis) and if you lower it you may not have enough cornering clearance.
Lowering a bike is not one of those "definitely don't do" things, but I would put some thought into it.
I am a motorcyclist, NOT a biker.
1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
1994 Yamaha XT225 parts bike