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post #17 of Old 02-09-14, 15:54
JanM
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Nice work Dave. I probably won't do that as they generally seem OK.

Today I took apart my cartridges to verify whats in them; 2008 Street Triple, 2006-08 675 Daytona and Street Triple R. There are differences between them all...

Same cartridge tube length, Striple is steel, STR and Daytona are aluminium. Rods are shorter on STR and Daytona due to different top with preload adjustment.

The valves are of same design regarding ports and refills, checkvalves uses the same springs. Topout springs are the same for Striple and Daytona, STR are softer - all have 19mm stroke.

Rebound needles for Daytona 675 are slighty more tapered than STR (very little). Could only have a look at the STR compression needles as the Daytonas are in the forks on the bike, they look nice and can be worked with.

Spring rates as measured and calculated today: Striple 0.78kg/mm, STR 0.83 kg/mm, Daytona 0.95 kg/mm. All rates are calculated to the lower rate as they have a slight taper, which increases rate a little. Striple is 10% off my earlier measurement, could be a different spring and indicate variation.

Topout spring rates are 1.17 kg/mm for Striple and Daytona, 0.93 kg/mm for STR.

Compression bleed for Striple is 1.2mm, none for the others.

Rebound bleed is Striple is 1.1mm, STR 1.0mm and none for Daytona.

Compression stacks are:
Striple (6).15x16, .15x15, .10x14, (3).20x8, 1.6x16
STR (5).20x16, (2).15x15, (2).15x14, (2).15x12, .20x10, 1.6x16
Daytona (8).15x16, .15x15, .10x14, (3).20x10, 1.6x16

Rebound stacks are:
Striple (3).15x16, (2).11x15, (2).11x14, (2).11x12, .20x8, (2)1.6x16
STR (5).15x16, (2).11x15, (2).11x14, (2).11x12, .20x9, 1.6x16, (3).30x9
Daytona (5).15x16, (2).11x15, (2).11x14, (2).11x12, .20x9, 1.6x16

I noted the thin rebound shims as .11 because they measured .11 and felt stiffer than the .10 in the compression stack. It is also a standard size, the difference between a .11 and a .10 is that the .11 is twice as stiff as a .10 if calculated as deflecting beam. Still they are not very stiff..

Next thing will be to compare lengths of stanchions and outer tubes, assembled forks etc.

Last edited by JanM; 02-09-14 at 16:20. Reason: typed Daytona compression clamp wrong
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