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SirJAG said:
5 mm static sag rear

I will add a little more pre-load.

If anything, it’s on the plush side but I have no issues running wide in corners the bike’s rear end hooks up very well, and I’m only bottoming out on the track when full throttle once the bike is stood up, coming out of a corner. . I’m bottoming out on the street basically every ride when I’m using maximum torque to pull dank Nooners!
Click to expand...

I have written down to aim for 10-15 mm static rear sag. Might be worth the bumping up a rate or 2
 
SirJAG said:
i weigh 225 lbs in full track gear. I am +2 rear, 15/41. I know b/c i put a small zip tie on the inner shock tube (not sure proper name). I hammer it in 2nd gear (usually riding out wheelies or some other hooligan ....) and when I look down right after the zip tie is tight against the bump stop.

It happens less now, with the 95N ohlins spring..
I suppose i could increase the preload on the rear, that should in theory stop that from happening so easily...but my rear SAG is already 25mm...more preload will give me even less SAG...and i'm not finding any suspension guys out there recommending less than 25mm.

Oh and my static SAG is 5mm.

Front SAG = 30mm, and Front Static SAG = 8mm

thanks for the feedback and questions @SuperDomestique !
JAG
Click to expand...

Your "static" or bike sag is off on both ends. Look back through the thread for correct recommendations.
 
OK, so if anybody with a corse dynamics tool would be so kind to give me the "ride height reading" of a stock 1199r or 1299s I could backward engineer a tool that uses very close numbers. Currently my 1299s axle length is 534mm, 15/41 gearing, 306 shock length. Is 306mm the factory setting on shock length?
 
You can't use shock length to get the swingarm angle correct. Chain tension, shock preload, swingarm pivot and gearing will all affect the end result. You need the tool and the Corse Dynamics tool wasn't very accurate.
 
roadracerx said:
You can't use shock length to get the swingarm angle correct. Chain tension, shock preload, swingarm pivot and gearing will all affect the end result. You need the tool and the Corse Dynamics tool wasn't very accurate.
Click to expand...

Yup, looks like dan kyle racing still makes the tools so Ill have to go snag one of those. Thank you for the info on the corse dynamics tool. Thats the kinda info I am looking for!
 
This is great..
Ray Charles Laugh GIF
 
roadracerx said:
You can't use shock length to get the swingarm angle correct. Chain tension, shock preload, swingarm pivot and gearing will all affect the end result. You need the tool and the Corse Dynamics tool wasn't very accurate.
Click to expand...

Would shock length be used to correct geometry changes from gearing? I'm +1 on my 959 but still at 106 links
 
Thanks, one more question. I'm 200lbs in gear, slow advanced pace. Just put in new nix cartridges with a 10 in 1 fork, 9.5 in the other. And a used ohlins shock from a 959 corse. Came with the stock 85kg spring and a fresh service. Trying to set the sag and I have 18mm of bike sag at this preload. seems like a lot of thread already, but I really have no idea. Is this considered 15mm of preload and how much would be too much?
PXL_20230617_010336812.MP.jpg
 
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@Colmn you need to know the free length of the spring in order to know how much preload is on it which has nothing to do with the threads on the shock body; measure the length of the spring. Also, it is quite hard to adjust shock preload without affecting shock length on the 899/959/1199/1299. I recommend removing the shock to measure properly.
 
I have a 22 V4S
Weigh 220 with gear
Ride slower end of A group pace, using only 1 gear, so making it all up in braking and cornering.
I changed out the front springs to 10.5
But I still am bottoming out when braking hard at max preload.
Not sure what to do, the stiffer spring and full preload is negatively affecting front end feel, but bottoming out isn't good either when trying to tip in
 
roadracerx said:
@Colmn you need to know the free length of the spring in order to know how much preload is on it which has nothing to do with the threads on the shock body; measure the length of the spring. Also, it is quite hard to adjust shock preload without affecting shock length on the 899/959/1199/1299. I recommend removing the shock to measure properly.
Click to expand...

Spring is 01092-26/85 the online reference says it's 170mm. Reading through the thread it seems I should be looking for 154 -160 mm installed length. So I should back out the preload all the way, remove the shock, measure, but then whats next sir?
 
Spring length is 155, so that would make preload 15 mm? I guess I'm just confused because I heard these bikes came with no static sag, yet I have quite a bit
 
@Colmn did you remove the spring to measure the free length? The springs are never the exact length they are supposed to be. What I mean is a 1092 spring could be 171 or 169 mm, they are all different.

From you post above it sounds like you have 18 mm of BIKE sag when you are at 15 mm of preload on the 1092 Ohlins spring which has a rate of 85 N/m, is this all correct?

The shock spring is too soft for a 200 lbs rider. Do you have a 90 or 95 available? If so, I would likely start with a 95 N/m spring of the same type: 1092 with 11 mm of installed preload.

Your target should be 30 mm of rider sag and 10-12 mm of bike sag.
 
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roadracerx said:
@Colmn did you remove the spring to measure the free length? The springs are never the exact length they are supposed to be. What I mean is a 1092 spring could be 171 or 169 mm, they are all different.

From you post above it sounds like you have 18 mm of BIKE sag when you are at 15 mm of preload on the 1092 Ohlins spring which has a rate of 85 N/m, is this all correct?

The shock spring is too soft for a 200 lbs rider. Do you have a 90 or 95 available? If so, I would likely start with a 95 N/m spring of the same type: 1092 with 11 mm of installed preload.

Your target should be 30 mm of rider sag and 10-12 mm of bike sag.
Click to expand...

No I didn't remove the spring to measure, just trying to wrap my head around the concept of it. Ducati Omaha chart said I should have been fine with the 85N/m, so that's why I was concerned. If I were 20 lbs lighter it still would be 15 mm of preload to get 18mm bike sag, so I was assuming something was wrong. Especially if 16mm is the max amount of preload that should be used
 

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