42t Sprocket Weights for Vitpilen 701, Svartpilen 701, and Duke 690

[BISavage]

As far as the chain length goes, 112 vs 114

I know generally longer wheelbase is better for straight lines and shorter better for tight turns.

Specifically for the Vitpilen / Svartpilen 701, is there a school of thought as to which is better 112 or 114?

 

[svartron]

As far as the chain length goes, 112 vs 114

I know generally longer wheelbase is better for straight lines and shorter better for tight turns.

Specifically for the Vitpilen, is there a school of thought as to which is better 112 or 114?

The little shorter wheelbase of a 112 chain results in more clearance between wheel and tail tidy if fitted.

 

[BISavage]

I edited my question above to include Svartpilen 701.

Good point with the tail tidy.

 

[Ben Dover]

Remember, the longer the chain effected wheelbase, the more leverage on the rear spring.
So a shorter chain yields less sag on the rear suspension (spring) while a longer chain wheelbase yields more sag on the same spring.

 

[BISavage]

That is also very interesting, not to diverge from chain and sprockets too far into suspension - would expect different weight, from the chain and/or sprocket, to also require different damping settings, similar to different tires.

 

[BISavage]

Heres another one:
(I personally prefer the Ognibene)



To scale calibration - measured 198g on my scale for a JT Ruberized 15t; similar to @Vatte

 

[Vatte]

If I have known this earlier that there is also a lighter damped front sprocket. Damn

 

[Vatte]

So I pulled the trigger on a 3D520SP chain. At the same time I went with the known JT 15 teeth front sprocket and a JT 42 teeth aluminum rear sprocket.

• JT steel 15t, JTF190215RB, 11.61 € ~ 12.80 $: 198 g ~ 0.4365 lbs
• JT aluminum 42t, JTA89742BLK, 22.79 € ~ 25.13 $: 239 g ~ 0,5269 lbs
• 3D520SP chain, 189 € ~ 209.18 $: 120 links = 1809 g --> 100 links = 1507 g

Weight loss rear sprocket: 520 g (JT steel 42 teeth) - 239 g (JT aluminum 42 teeth) = 281 g
Weight loss chain (114 links): 1888 g (OEM) - 1718 g (3D520SP) = 170 g

View attachment 4093View attachment 4094View attachment 4095View attachment 4096View attachment 4098View attachment 4099View attachment 4101View attachment 4102

Update regarding the front sprocket. I changed it from JT JTF190215RB to Ognibene 7118R15 to save 32 g (198 g - 166 g) weight.
So in total I saved 483 g on the sprockets and the chain.