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Enduro Suspension Tuning & maintenance of Enduro forks, shocks, etc |
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#1
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MR Pro 300 springs.
Just picked up a '23. I weight around 205 so I'm figuring 54 N/mm for the forks. What's a good # for the shock? I looked at the owner's manual which claims a 4.4 N/mm but that doesn't seem right.
Who's a good source for the springs? Thanks.
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04 Montesa 315R, 07 EC300, 21 KTM Erzberg 300, 21 Sherco 300 SEF-F, 23 KTM 690, 23 Rieju Mr Pro 300 |
#2
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54 sounds very stiff to me. I have KYB SSS forks from a 2007 YZ450F on my 2000 XC300. I used the RaceTech calculator and they estimated 48 for me when I weighed 245 lbs for Enduro B. I am down to 235lbs and I wanted it a bit softer so I went back to the stock 47 springs.
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#3
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Are you going to ride SX on that thing? .54 up front is seriously stiff for your weight. I run .38 front and 4.8 rear for my weight at 140lbs, Beers (remember him? lol) runs .40 at 170lbs with his KYB SSS and a 5.0 rear. That said, I can ride his bike without issue.
For your weight I would probably be looking at going .44 up front with a 5.4 in the rear.
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WildAzzRacing YouTube channel Trail Riders of Southern AZ club AZ State Parks OHV Ambassador '11 EC250R '98 KDX220 |
#4
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First, you probably know this Ud luz, but make sure that you are recognizing the difference between N/mm and Kg/mm when you're dealing with springs, both in this discussion and when ordering.
The N/mm to Kg/mm conversion is 0.10197. So in my case, I had miscommunication with the Dealer - I asked for a 5.4 N/mm shock spring (when I meant 54 N/mm - no decimal) and he got me a 5.4 Kg/mm spring, which is only a slight step above the stock rear spring (which is 52 N/mm or 5.3 Kg/mm). Some confusion also exists in this thread where you mention 54 N/mm for the forks, and we are assuming that you mean .54 Kg (which I agree is way too stiff). A 5.4 N/mm fork spring would be too stiff also. The GG manual that I have shows recommendations in N/mm, which is the "less common" designation used. A second question - are you 205 lbs. with or without gear? If that's your "dry" weight (no clothes), add 25 lbs. for gear. The answer to that question obviously changes things I will try to attach a chart and then post again with later with my experience. Jeff GG Spring Rates PDF.pdf
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'18 GG XC 300 '05 GG DE 300 '01 GG txt 321 |
#5
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Oops, I meant 44 on the forks, not 54. I'm 205 without gear.
Jeez, might as well put 2x4's in with 54 springs. lol
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04 Montesa 315R, 07 EC300, 21 KTM Erzberg 300, 21 Sherco 300 SEF-F, 23 KTM 690, 23 Rieju Mr Pro 300 |
#6
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LOL! Glad that's straightened out.
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WildAzzRacing YouTube channel Trail Riders of Southern AZ club AZ State Parks OHV Ambassador '11 EC250R '98 KDX220 |
#7
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No worries there, and at 205# w/o gear you're probably more like 230# with gear. So you are a "step up" from Jacob and I. That would indicate .47 Kg on the forks and 5.7 Kg on the shock, if you go by the GG manual (which seems consistent from what I've read).
But you will find available springs (in Kg) to be either .46 or .48 for the forks; shock will be 5.6 or 5.8. So (being no expert) I would suggest .46 for the forks and 5.6 for the shock. But those could be one step too light! (Google "kyb spring rate for 230# rider"). You might want to consult a tuner. For a source - Cannon Racecraft (Oklahoma City). They are high quality and can get you whatever you need. Ask for springs for a YZ250. Jeff PS - The stock GG fork springs are 454mm long (you don't want 470s). The stock GG shock spring is 260mm long (you can order the YZ spring at 270mm, which is what they have in stock and it fits just fine).
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'18 GG XC 300 '05 GG DE 300 '01 GG txt 321 Last edited by farmerj; 05-16-2023 at 11:26 PM. |
#8
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Quote:
https://www.ktechsuspension.com/us/o...ear-suspension
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TeamFlannelOutdoors-somewhere South of I80 05' Gas Gas 300 DE (Son's) 22' Rieju MR300 80th Anniversary Edition. 02' Gas Gas 250 XC Moto Farm motor and suspension service 309 310 2540 leave a message www.halls-cycles.com |
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