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10/23/2023
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Spokane, WA
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I am a 170lbs right now and am aiming to be 160lbs at the start of the season.What fox spring should I get to get 30% sag?
Springrate Help for Commencal Supreme V5
There's no slam dunk way to know what your correct spring rate is without trying a few springs, but according to the Fox spring calculator you could try starting with a 325. These spring rate calculators aren't the most accurate, but they can be a helpful starting point. Plug in your numbers and see what you get: https://tech.ridefox.com/content.php?c=springcalculator-embed
Depends which shock mount you use.
Say you are in front high, I’d suggest starting at 525. I’m 180lb and 550 was about 28% in front high.
The rear hole is even softer initially, so you’d need a 550 or 575. The v5 also needs a very stiff compression tube. Fluid focus in California has some great settings they developed with some World Cup racers.
Unfortunately you're just going to need to bite the bullet and by a few springs.
Highly recommend getting a springdex that will allow you to adjust spring rates more easily. You can then move to a lighter "weight" spring (or not) if you're worried about overall weight for some unknown reason.
I agree this does help you get in the ballpark, but the only negative to a springdex is that it adds progression at the end of the stroke. The V5 is already so progressive, personally I wouldn’t want that.
Maybe the rider can borrow from friends to test, but I would put money on it that they are a 500, 525 or 550 depending on style and terrain.
How is it possible that the Fox calculator is 200 pounds off? That's wild to me. Not saying you're wrong, and I even thought "man 325 sounds pretty light," but 325 vs. 525 is a pretty wide disparity.
325lb sounds like it could work for the 2022 Supreme. You can see the difference in leverage ratios here
Also 30% sag is super soft for most DH bikes, but especially progressive ones like the the Supreme. The old bike suggested something like 15-18% at the shock, since the relatively high initial rate means that works out closer to 30% at the wheel. This is also the thing that throws off most spring calculators if it isn't taking in to account the specific change in leverage ratio. For the V5 I aim for 20-25% (standing up, weight on the pedals)
Looking at the V5's I've set up I would put you on 450-500, and there is a 450-490 sprindex which should work well now and also if you drop down to 160 pounds.
I also agree they need a relatively firm tune to work best
Agree with your note about measurment at the shock. I forgot to mention my sag was calculated at the rear axle.
So as mentioned 24-25% at the shock will get you 27-28% at the rear axle. 30% at shock is far too soft and would be like 33% at axle.
FWIW, Commencal specs these rates on the DHX2 equipped frames: 400 lbs on S, 450 lbs on M, 475 lbs on L, 500 lbs on XL
https://tech.commencal.com/bike/COMMENCAL-SUPREME-DH-V5-SIGNATURE-PURE-WHITE/572.html
Not terribly helpful but a place to start.
The Fox tunes they spec are:
Compression: CX003
Rebound: JCR010
Both slightly stiffer than the Fox standard aftermarket shock tune of CX002 and RM.
https://tech.ridefox.com/bike/parts-drawings/2957/float-x2-part-informa…
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