[jegdichovski]

Hello. Neubee here.
What's is the most fork travel/upgrade that I can put on 2020 Trek Top Fuel 8 XL going from Rockshock silver 120mm that is a stock fork. I regularly bottom out although pressure is by spec and there is nothing wrong with it otherwise.

I am 250lbs and was told any increase in travel will change geometry significantly and put a lot of pressure on steer tube causing it to crack.

Some places are mentioning it is safe to go 140mm...no idea, Trek website has no documentation on it.

I appreciate any insights.

 

[Ghost021]

Trek listed 130mm for max fork travel on the 2020-2021 model Top Fuels.


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[PhillipJ]

That 130mm figure is in the FAQ here if you want to check. Scroll down to the Bike tech section.

Top Fuel 9.8 | Trek Bikes (NZ)

 

[eb1888]

The plastic Motion Control damper in your fork has very poor performance capability. No small bump compliance and is overwhelmed when the speed goes up. You can't upgrade the damper. A working fork at 130 would be a major improvement. A used Pike with a Charger2 damper or a Marzocchi Bomber Z2 or DVO Diamond would change things.

 

[jegdichovski]

Thank you all for the help!