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Old 17-06-2019, 07:52 PM   #1
jerry
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interesting spring rate

My old M750 was 3 years old when i got it in 2003 and the previous owner had added a lot of goodies ,,, now 19 years old Im giving her a major refresh after my daughters accident last year ,,

had the forks apart and I was told they has Ohlins 8.5nm springs in with 5w oil ... but what came out was progressive springs probably hyperpro

now the bike has always handled impeccably and been comfy and controllable with the standard showa forks but Im curious what is the Progressive Spring rate ???

so today went down to faulkner springs who have a very expensive spring test bed for Mclaren cars who the make the suspension and they tested my fork spring ,, seems it starts out at 6.5nm and steadilty goes up by 7.5nm at 25mm to 8.5 at 50mm and 9 nm at 75mm interesting



so now I know ....
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Old 17-06-2019, 08:11 PM   #2
Blah blah
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I had progressive springs in my old 750 - I never understood all of the negative comments they get as for a normal person on the road, I thought that they were great.
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Old 17-06-2019, 08:13 PM   #3
utopia
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That is most interesting.
First time I've ever heard anything like a spec for progressive fork springs.
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Old 18-06-2019, 05:10 PM   #4
jerry
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I have used progressive springs in Cars and HDs and old Brit bikes and they work well for standard road use but when tuning bikes with very adjustable forks I find linear springs are best like in my S4 ,, it really did not like progressive springs made it dangerous ,

my 750ss has linear standard springs rated 9nm and no adjustable forks but handle superb ,,
The M750 is also fine ,,and i will not be modifying the forks at all ,, just a refresh and new oil ..
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Old 20-06-2019, 10:42 AM   #5
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On this point I won a pair of Hyperpro springs on ebay last week, bargain.

I got in touch with them and they don't rate their springs other than to say.

"Our springs are suitable for persons between about 70 to 100kgs.
Since they are progressive, they offer more resistance the more they are compressed."

I suspect they will be nice for road use and will do so at some point.
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Last edited by Stafford; 24-06-2019 at 08:21 AM..
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