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When I bought my Aeris9 Ben advised me that a 475lb spring would be best but, as formula don't make one, to go with a 450lb spring and add some lsc on the ups. This works well enough, but I'm over the "2 turns for preload" limit for correct sag and feels a bit trapdoor-like going down hill.
I'd like to get a 475lb spring but wanted to know how accurate and comparable manufacturers are? I've asked MRP (who make 475lb springs) and Formula (who make the shock) but haven't had a response, despite chasing up. Nukeproof also make them but the user reviews suggest that they are softer than supposedly softer rockshox springs.....
So, in short, is there any way of knowing whether a 475lb MRP spring is really 25lb more than a formula 450lb spring without putting them both on the same test bed? It isn't like they are cheap enough to buy a few and see unfortunately....
I don’t think there’s an easy answer on this one tbh. I think rockshox are supposed to be quite accurate, as are Ext. You might better just going for a 500lb in the same brand.
Also when you say it’s trapdoor like on the descents (presumably at speed) then don’t you need to add some high speed compression rather than lsc? If you’re hitting stuff hard ish then it’s probably high speed piston speed rather than low speed isn’t it?
I think EXT used to measure and sell the exact rates as made and measured. I think they typically varied plus/minus 5%
try jtech wps as they dyno their spring to check the rates
https://j-techsuspension.co.uk/collections/springs/products/wps-sicr-springs?variant=43918370799867
Cheers all, much appreciated.
I'd say not.. It's difficult enough with aftermarket car springs.
So many variables involved with different manufacturers.
Have a look a sprindex, works well as you can increase/decrease spring weight in 5lb increments over a a total of 50lbs
Really it should have a spring constant (k value), the old Stendec/Eibach springs were great, wonder if they're going to have a revival?
I spoke to TFTuned about this very issue because as well as spring rate and fitment, there's a deal of quality between manufactuures in terms of accuracy of said rate (which at lower rates is a pain). I've got a few Ohlins and Cane Creek springs for mine, which covers the various bases in terms of riding and rider weight change. They were helpful, so adive to ring them. If you can fit the ohlins ones, they go up in 'weird' increments as they are metric, so can plug gaps left byu fox et al