| With my extended by Spondon swingarm, the mounting points are in the same place for the rear suspension so to compensate for the extra 20 mm of length idealy the spring should be uprated by the same percentage which is around 5%, so for most riders this is hardly worth the trouble especially if been used in conjunction with mag wheels. Some Mag arms are designed to be used with different rockers (not sure if this applies to all) so it will depend on how these rockers affect the leverage on the shock to wether you have to change the shock unit or the spring. With my Mag arm I am using the Race spec Ohlins but I also have a alternative spring with it that allows me to use it with a standard length swingarm.
A lot of Ducati riders using there bikes on the track tend to run the eccentric adjuster as far rearwards as they can, but I bet very few of them alter the suspension settings by much let alone change the spring, just as very few people fit a different spring when fitting lighter wheels.
If a spring change is necessary it is usually a very small change and more often than not the range of the damping on the shock will be able to cope, but if it can't then a revalve may be in order, then again every so often a Ohlins should be sent for a service anyway, roughly at the same interval as a fork oil change.  |