I’m getting back into the game after a several year hiatus. This time around I’m wanting to take the time and money to set my bike up right. I’m on a 2026 yz250f and weigh 220lbs. I don’t plan to race again but if I had to categorize myself I’m probably a low to mid pack local C class rider on a good day. Among all of the spring rate calculators the racetech one has me a bit stumped because it seems to have me going up quite a bit on the rear spring but the fork spring appears to be the same as stock. If I only bump up in rear spring rate won’t that likely make the bike feel imbalanced? The numbers that I found for the stock fork spring rate is 4.7 n/m and the racetech calculator is matching me with a .47kg/mm spring. I have been struggling with finding a conversion rate between the two that makes complete sense but from what I understand the conversion should work out to around 4.7 n/m give or take. Can anyone help confirm that? As an additional reference the JBI calculator matched me to 5.0 n/m fork spring and a 64 n/m shock spring.
Racetech Spring rates are to be used with their valving, which doesnt make a ton of sense. Call a local tuner or big shop and ask for their recommendation for stock valving
I am about the same weight and have a 27 model, it's an updated model but i believe they still have the same spring rates.
I went up from 54nm to 56nm in the rear and put one 5.0nm in one side of the forks and im pretty happy with that. I will probably put both 5.0's in the forks and try that though cos I feel it is a little soft still. I'm happy with the rear but.
For reference I'm Vet B speed and just ride moto, I also prefer my suspension on the softer plusher side.
Race Tech usually compensates with higher oil volume in the fork, that would explain a lighter than expected spring rate.
Valving is important too, especially when changing spring rates by a few sizes.
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