XRAY 358279 Long Progressive Rear Springs Soft-Medium Edition  [XR-358279]

Tune rear balance with XRAY long progressive springs

XRAY 358279 Long Progressive Springs give a practical tuning path for competitive drivers who want a more progressive rear spring curve. These springs feature a soft-to-medium rate and two stripes for identification, fitting the rear suspension of XB808 and XB9 vehicles to help sharpen corner entry and mid-corner stability.

Progressive behaviour engineered from track feedback

Developed using race insights, these springs have a more progressive characteristic than standard XRAY springs. The softer initial section boosts tyre contact when entering a corner, then the rate increases as the spring compresses to maintain control at higher loads. Each spring is individually checked and matched so both halves of a pair behave the same under load.

Matched and measured for repeatable setups

Every spring is compressed and measured in tight increments during manufacturing so pairs are matched for consistent damping. That consistency reduces tuning guesswork and helps you reproduce setups across events.