Hi, I just got my hands on a second hand Ohlins TTX... I want to put it on my 2010 848 (non EVO) I've been googling all morning to ty to decode the spring number... 21040-29/90 L088 I think that I've managed to work out that its sprung suitable for me (12 stone not including my gear) I can't work out the spring length... Any help much appreciated.... Thanks, Bob
Hi there. I have a couple of TTX shocks, and I can't decipher the rest of the code for you (it is most likely model number codes), but the "90" part is the Newton Metres (nM) of the shock, indicating stiffness (force required to compress). I am 65kgs (10.5 stone) and run an 80 with little preload. At 12 stone, a 90 won't be far off for you, but you don't want much preload would be my guess. You would probably be able to get away with an 80 with more preload, or a 90 with little. Does the length matter at all? If it fits the shock it is fine (i.e. is the right length for the body of the shock) - if it's on there already it must be.....
Yeah, that's correct. The 90 is nm. My triumph one was '120' for 12nm and I swapped it for a '105' which is 10.5nm. The rest is spring pitch and length but google ducati Ohlins decoder as there were some tables posted on one of the forums.
Many thanks - I went to a yamaha forum ( please forgive me ! ) and it looks like the spring length is 160mm. Most spring start with a 1, which confused me; but I think the 21040 = 160 mm... The shock is a DU711, which I think can take the hydraulic pre-load adjuster from the 718. I didn't know that at the time; but I might try to get that done.... I'm entering the bike in an endurance race with NL, so may help when we swap riders, and my team mate is a bit lighter than me. Therefore might swap spring for an 80?? Thanks, Bob
you need to work out what rocker you are using with it as that will influence spring strength as well as what shock valving you have……which i bet you don't know at the moment...:wink:
Andy, Yep, no idea of either at the moment! Rocker will be standard 848 (non EVO); as for valves ??? I'm planning to get it serviced and set up by someone professional before it goes on the bike... Thanks for response
The TTX I have on my 848 is an 80nM, so you are on the same linkage ratio etc - so you are comparing like with like against mine as a setup. I think you are borderline 80nM and 90nM - so should be fine. Your mate would likely be on an 80 then though if he is lighter. But unless you are out by miles, just drop the preload to almost zero when he is on it and you will be close enough surely..... rear ride height will make more difference (have you got an adjuster?)
Cham, thanks... I'll be 165 lbs one I have shifted the extra Christmas pounds so may well drop down to an 80? My mate weighs 155 lbs... I've got a ride height adjuster so will put that on when I change the back shock... As a base set up, can I ask how much you weigh and how much pre-load you've put on, compression and rebound clicks?. I'll get it set up properly, but wanted a good starting point? The only hydraulic adjuster I've found so fat is over £300, so I won't be getting that.... Not worth it for only 10lbs difference?? Thanks, Bob
1091-34/100 is an example of a code you will find on an Ohlins shock spring. Using the below charts you can “decode†what you are looking at. • The 1091 refers to the diameter and the length of the spring. Almost all Ohlins springs have a diameter of 57mm so that’s easy, the 1091 in this case means it has a 160mm length (when not on the shock) • The -34 is the spring rate. For some unknown reason Ohlins uses it’s own numbers to label rate, but below on the rate conversion chart you can cross reference this number. In this case a -34 is a 100nm or 10.19kg or 571lb spring • The /100 is the springs rate in Newton meters, but without the decimal. In this case the /100 means it’s a 100nm spring. Art. nr. Rate N/mm Kg/mm ibs/inch -88 28 2.85 160 30 3.06 171 -90 32 3.26 183 -01 34 3.46 194 -02 36 3.67 206 -03 38 3.87 217 -04 40 4.08 228 -05 42 4.28 240 -06 44 4.48 251 -07 46 4.69 263 -08 48 4.89 274 -09 50 5.10 286 -10 52 5.30 297 -11 54 5.50 308 -12 56 5.71 320 -13 58 5.91 331 -14 60 6.11 343 -15 62 6.32 354 -16 64 6.52 365 -17 66 6.73 377 -18 68 6.93 388 -19 70 7.13 400 -21 75 7.64 428 -24 80 8.15 457 -26 85 8.66 485 -29 90 9.17 514 -31 95 9.68 542 -34 100 10.19 571 -36 105 10.70 600 -39 110 11.21 628 -41 115 11.72 657 -44 120 12.23 685 -49 130 13.25 742 -54 140 14.27 799 -59 150 15.29 857 -64 160 16.30 914 -69 170 17.32 971 -74 180 18.34 1028 -79 190 19.36 1085 -84 200 20.38 1142 -89 210 21.40 1199 Spring Length Chart 1093- 1091- 1092- 150 mm 160 mm 170 mm 5.9" 6.3" 6.7"
