lowering...how much? - Sportbike Forum: Sportbike Motorcycle Forums
 
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post #1 of 4 (permalink) Old 06-23-2004, 09:09 AM Thread Starter
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lowering...how much?

How much can I push the fork tubes up thru the triple tree on a 04 Gixxer 750? I'm dropping the rear a smidge and would like to even it out at both ends. I want to know what safe limits are. Any help is appreciated. I'm 5'7" and it's just too tall .
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post #2 of 4 (permalink) Old 06-23-2004, 09:19 AM
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The place we had our F4 lowered at recommended lowering the front and back the same. I've also heard of people taking the front lower than the rear, but don't know about the pros/cons of that.

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post #3 of 4 (permalink) Old 06-24-2004, 07:40 AM
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10-20 mm drop in front on a bike as quick steering as a GSXR750 is a big change. So that's less than an inch. If you drop the rear the same amount it's not an issue. The problem is a decrease in "trail" at the front. Trail is what gives stability to the motorcycle by making it want to straighten the front wheel when deflected to one side. By tipping the bike on it's nose you get quicker steering and less stability. Up to a point it's fine. Too much and you get easier tank slappers (it has a steering damper though right??). If the back is dropped the same amount there's no change in steering geometry. Be sure to drop the front as much as the back or it'll steer like a truck.

Start off with equal drop and then if you need more reach to the ground pull the forks up no more than 5mm at a time. Then ride it for a week to make sure you like the way it feels before dropping the front any more.

You might want to check on a custom seat, they're not that expensive and dont effect handling at all while you reach the ground much better. Make sure they know that's why you're getting the seat though so they shape the foam right.

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post #4 of 4 (permalink) Old 06-29-2004, 10:20 AM
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Mine is an inch and a half. You shouldn't need to go much more than that. I think I heard two is ok but anymore is pushing it. You loose alot of your turning radius.
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