From the very first GP Originals meeting the focus has been on forks. We have strived to ensure forks make a return to proportionate sizes for the machine.
Typical period forks
- 350cc machines were 35mm in diameter
- 250cc machines were 40mm in diameter
We understand that genuine original forks can be hard to find therefore we accept 35mm-36mm for the 350s and 40-41mm for the 250s. We allow forks sourced from other machines, within these sizes, but they must have a very similar appearance and period style.
The only exception to the diameter is the original Spondon 38mm fork that was designed and used throughout the 1970s and 80s. Please read our article for the timeline and further information. Replica or other 38mm forks on the 350s are not eligible.
As with all hard-to-find parts, riders should source the most period parts they can find over time. Classic racing presents a different set of challenges to modern classes – most riders collect parts as and when they appear for sale.
Replica forks
There are a number of suppliers providing period replicas such as Ceriani and Marzocchi. Please contact Maxton Suspension and JL Exhausts for prices.
It is your responsibility as the rider to purchase the most period option. The GP35R and GP35RD versions of the Ceriani have large external adjusters that were not present on the originals. These are now available with covers to make the adjusters more discreet and in keeping with a period machine. If you choose to use the GP versions please note that they will only be accepted with the covers in place. Likewise, other cartridge kits such as those available from Maxton, need to have the covers fitted for our races.
⇡ Ceriani replica GP35 range must include the covers available from the manufacturer. Likewise, other cartridge kits must have their supplied covers in place whilst taking part in our races.
Cartridge kits
You may upgrade your forks using a cartridge kit or internals from other machines. It is your responsibility to ensure that any external adjusters are in keeping with the spirit of the Series. Vibrant anodised colours and large damping adjusters would not have been a period addition – please see above regarding covers for cartridge kits.
Maxton Suspension are offering a 10% discount to all GP Originals members on their range of post-classic suspension products.
© Pete Morris 
© sport-pics
