Posts: 385
Joined: 9/3/2015
Location: China Grove, NC USA
i bought a spring a while back for a 16 250sxf and it is listed as 252.51 n/mm, i never installed it and now i have a 2018 ktm 450sxf and cant find where the calculator was that i used for the 250sxf over a year ago
so long question short will this spring work ok for my 18 ktm 450sxf i am 190ish without gear and just a out of shape 35 year old midpack c rider
Posts: 9744
Joined: 7/25/2009
Location: Nor Cal, CA USA
Those numbers don't make any sense. I would guess that that is lbs/in which would make it 4.5kg or basically 44n/mm.
That is softer than your stock spring and I wouldn't recommend going that way, but you can give it a try. I use 48n/mm for people 190lbs on a 450.
Posts: 385
Joined: 9/3/2015
Location: China Grove, NC USA
part number i ordered from rockymountain was 131307011550
its weird and i think its a messed up listing when i go to my order history because it appears the part numbers have been superseded
Posts: 385
Joined: 9/3/2015
Location: China Grove, NC USA
never mind i am retarded it is 51 n/mm
for some reason the listing has spring252 51n/mm
but when i look it up for a 2018 ktm 450sxf it is listed as spring 260 51n/mm
will a 51n/mm be to stiff? thanks for the help
Posts: 9
Joined: 9/2/2018
Location: HUN
Right now I test some different spring rates, I ran 45n/mm with my sx-f 350, after I change for 450 and I thought for my weight (195lbs with gear) the 48n/mm will be the right based on KTM chart.
Finally no, the 48n/mm was definietly too stiff, I could not setup the sag either, I recommend to try firstly the 45n/mm spring.
Posts: 9744
Joined: 7/25/2009
Location: Nor Cal, CA USA
I think so. I've used that for 210-215lbs a lot. It will be stiff with very little spring preload
The 252 is a weird number, 260 means the spring length
Posts: 385
Joined: 9/3/2015
Location: China Grove, NC USA
Posts: 1111
Joined: 8/20/2015
Location: USA
Posts: 385
Joined: 9/3/2015
Location: China Grove, NC USA
