Rear spring

Pavetim · Oct 16, 2018

2018 MXR. I am getting all the stuff from N2dirt for fork and shock revalve and mx tech Midvalve. I know the stock is over sprung, I am 230 and had my sag at 100mm and 30mm. Doesn't that mean the stock spring is fine for me?

Philip · Oct 16, 2018

It is a bit too soft for you.

Pavetim · Oct 16, 2018

Is it just this bikes geometry? My 450 the perfect sags are 105 and 35. This bike has smaller sag numbers? i have a 6.0 in my kx450 now and is perfect for my weight.

Philip · Oct 16, 2018

I think the Alta's motion ratio is different from the KX, and you weigh 50lbs more than the Alta's target rider. You can compensate by riding slower, but I do not know if this is what you want to do.

It is too soft for motocross, especially if you are a jumper. But should be okay for trail riding.

Fog 25 · Oct 16, 2018

I’am at 215 pounds and I run a 6.4 spring with 10 mm preload which gives me a 96mm sag on my N2Dirt supension I think a 6.6 spring will be good for your weight if you ride Moto. Trial riding a 6.4. The MXR has a different ratio in the linkage because of the wight of the bike so the standard 100/30 is off. You will be real happy with N2Dirt revalve.

Pavetim · Oct 16, 2018

Sweet

Philip · Oct 16, 2018

I'd recommend trying the 63N/mm (6.4kg/mm) first. You are a little heavier than Fog but probably not faster, are you?

Pavetim · Oct 16, 2018

Im not that fast. 450D rider

Philip · Oct 16, 2018

For my 200 lbs weight I like the stock 60N spring for ride and handling. But I will be trying the 63N spring if I want more confidence when jumping, I have one left over from my MX.

There are MX owners here who have 63N springs lying around, so you can save a few bucks by buying a used stock MX spring.

Philip · Oct 16, 2018

Fog, what fork pressure do you run?

Fog 25 · Oct 16, 2018

Philip said:
Fog, what fork pressure do you run?

I run 157 fork pressure. Put a O ring or a zip tie on the fork tube ride some laps and see how far down your suspension goes.
Adjust the air pressure a pound at a time up or down until you have about 1”to 1-1/2” left. That will be you’re right air pressure for you. Then you can adjust the compression and rebound for feel you like.

datadog · Oct 16, 2018

Our race team recommendation for rear sag is 95mm, Different link.

Pavetim · Oct 17, 2018

Wow he said he sent me. 6.6 spring.

Philip · Oct 17, 2018

Pavetim said:
Wow he said he sent me. 6.6 spring.

Look at this as an opportunity to step up to at least a B-rider's level!

Pavetim · Oct 17, 2018

Sure hope it's not too stiff, guess that is what Alta recommended.

Fog 25 · Oct 17, 2018

Pavetim said:
Sure hope it's not too stiff, guess that is what Alta recommended.

You most likely won’t even notice the 6.6 spring difference with the weight of the Bike. It will be good on the track

Fod · Oct 17, 2018

datadog said:
Our race team recommendation for rear sag is 95mm, Different link.

Details on this link?!?! N2 dirt also created some links for the alta!

Thread starter	Title	Forum	Replies	Date
S	18 MXR rear spring part number?	Suspension	2	Apr 6, 2019
	Fasst Company rear brake return spring on an Alta	Brakes	15	Mar 29, 2018
	dirt in the stop bump of the rear shock	Suspension	0	Monday at 5:46 PM

Rear spring

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