Hi Jon,
I did some research into the ohlins 90nm spring recently as I was looking to buy the ohlins shock and needed the bigger spring.
The 80nm spring has the code 01099-24/80. Ohlins no longer do a 90nm spring for the shock - if they did the code for it 'would' be 01099-29/90.
Minkyhead got hold of a spring with the code 698-29/90 that fitted the ohlins. As you can see the 29/90 part of the code designates 90nm spring. After some further digging I found that the spring minky got has a length of 230mm and the stock spring is 220mm long. It does fit the shock though - I've a feeling the 698-29/90 spring is from a tiger xc or something.
I contacted a UK supplier of the shock and sent them the code 698-29/90 for the 90nm spring to fit to the shock and the answer was they would search for it if I ordered the shock and see if they could find one.
OTR might have sent the wrong spring. Check the codes on the spring and if it says 24/80 then it's the 80nm one.
In the end I went with a different shock (Nitron) as they built it to my specs without all the faffing around trying to find another spring for the ohlins.
Hope that helps.
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