Geoff Aaron’s GasGas XC 300 EnduroCross Racebike

The all-new XC 300 goes racing!

GasGas XC 300
The two-stroke powerplant in Geoff’s 300 is very close to stock except for the S3 head, which increases compression slightly.Adam Booth

Geoff Aaron is a 10-time National Trials champion and a veteran of the EnduroCross series. He spends a good chunk of the year traveling the country entertaining crowds with his gravity-defying trials show, and most recently he joined GasGas to further expand the brand in North America. Geoff's current EnduroCross racebike is the all-new 2018 GasGas XC 300 electric start two-stroke and he is very happy with the improvements.

The two-stroke powerplant in Geoff’s 300 is very close to stock except for the S3 head, which increases compression slightly. The only change to the Keihin carb is a switch to a leaner 172 main jet. An FMF Factory pipe and FMF Powercore 2.1 muffler replace the stock units. Pump gas is mixed 50:1 with Spectro oil.

GasGas XC 300
Left: EnduroCross wreaks havoc on the underside of a dirt bike; an SXS full-coverage skid plate with linkage coverage is used. Right: Helping him slow down are Nissin brakes with Galfer brake pads.Adam Booth

Right now Ty Davis is servicing the suspension and experimenting with spring rates, but Geoff feels the stock KYB equipment is very good so radical changes aren’t necessary at this point. Geoff runs softer suspension than most EX guys even though he’s one of the tallest riders on the track. His extensive trials background is partly the reason for the soft suspension. Final gearing is 13/51 and comes via Renthal sprockets and chain. Renthal also provides the 996 handlebar and grips. Keeping the Renthal chain in line is a TM Designworks chain guide. Bullet Proof Designs provides protection for the radiators, rear brake rotor, and swingarm. Because EnduroCross wreaks havoc on the underside of a dirt bike, an SXS full-coverage skid plate with linkage coverage is used. Helping Geoff to get a good start is a Works Connection starting device and helping him slow down are Nissin brakes with Galfer brake pads.

GasGas XC 300
Top Left: That pipe won't stay that clean for long. Top Right: An FMF Factory pipe and FMF Powercore 2.1 muffler replace the stock units. Bottom Left: Bullet Proof Designs provides protection for the radiators, rear brake rotor, and swingarm. Bottom Right: The only change to the Keihin carb is a switch to a leaner 172 main jet.Adam Booth

Tire duty is handled by Dunlop with the use of an MX52 up front and a Dunlop D756 gummy on the back. Providing flex and traction are Dunlop foam inserts. The front foam insert is standard while the rear foam insert has holes drilled in it for more cushion and flex. Miscellaneous titanium hardware helps lower the overall weight on the already lighter 2018 model. HBD number-plate backgrounds ensure everyone can see that big number 4.

Geoff tells us he is really happy with the production bike, but it is very new and a work in progress so he will continue to test and change the setup as the season progresses.