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when compared to the horizontal (parallel to the ground). The steering axis is the axis about which the fork, handlebars, and front wheel pivots. The steering axis angle matches the angle of the head tube. Fork offset is the distance from the center of the steering axis to the center of the fork axis. Trail is the horizontal distance from the point where the steering axis intersects the ground to where the front wheel touches the ground (see diagram on page one). Changing the offset is a time proven method of adjusting how fast a bike steers.

Our 08 YZ250F suspension handles most tracks pretty well in nearly stock form with a 175 lb. rider onboard. The only modifications we have made to it are: we had the fork tubes and shock shaft hard carbon coated by Extremeion and we changed the pressure springs (the small one which is part of the cartridge at the top of the fork) from the stock 2.02kg to a lighter 1.8kg. The softer springs allow the fork to give a plusher ride over high speed bumps, the small ones that make the bar feel like it is going to shake out of your hands. The springs are a cheap mod that really works well. They are available through Race Tech Suspension. The Yamaha is stable at speed and turns without too much effort and is comfortable to ride for extended periods. If we were to change anything about the handling it would be the way it turns in slow to medium speed corners and the how it rides through rutted corners. It requires a good shove at the bar to initiate slow speed turns and likes to ride out of ruts mid turn, small things we can live with but would love to improve.

While talking with the guys at RG3 about suspension set up, we got to talking about the issues we were having with the 250F, they suggested we try a set of their 22mm offset clamps for a cure. Getting our YZF to turn better in ruts would be a welcome change so we agreed to give the clamps a try. We installed a set of upper and lower triple clamps with a 22mm offset to replace the OEM units which have a 25mm offset. Installation is time consuming but no more difficult than servicing your headset bearings, plus it offers good opportunity to regrease those bearings.

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