I weigh 181 (today). Suggesting 10 or 15?

 

https://trackerdie.com/products/39mm-damper-tube-assembly

$79

 

I would run with 10. I ran 7w in mine but im 25 pounds lighter.

 

Yea and momma wants to ride too.

 

If you are looking for fork oil, you might want to ignore the weight of the oil as there is much variation on manufactures fork oil "weights"
HD recommends Type E fork oil for the Sportster forks.
For comparison the viscosity of Harley Type E fork oil is ~41.1 cSt @ 40C / 100F, and 7.7 cSt @ 100C / 212 F.

Pick a fluid based on the viscosity at 40C / 100F as the forks will not normally heat the oil to much over ambient temp on your Harley.


This link lists the actual viscosites of many of the fork oils:
http://peterverdone.com/wiki/?title=Suspension_Fluid
"DO NOT GO BY LABELED OIL WEIGHT!
Not only is this a poor way to decide which oil to use, but each manufacturer seems to be on a different scale.
For example Maxima RSF 7wt is actually lighter than Spectro 5wt and Silkolene Pro RSF 7.5wt is actually heavier than Showa SS-8 10wt.
This is not a judgment about the quality of these oils, just that the 'weight' label leads to a lot of trouble when trying to tune with suspension oils."

 

Interesting. Never heard of the viscosity variation like that, but it makes sense. Everything else has parameters. Will check with local HD dealer before opening up the forks.

 

Lol just remembered, I used motor oil in the shocks of the TR6. It was simple. Cast iron body with 2 chambers side by side, and pistons in each side, with tiny hole in the top of each. The external shaft would move one piston up and the other down simultaneously, thus "regulating" wheel up and down movement speed. Suspension was 4 wheel independent coil springs.

Changing that oil from 10w to 20 or 30 made a huge difference.

 

Another fork question, thinking WAY down the road here. I really like wylee's dual sportster, and hopefully someday can add/build one myself. On the front forks, is the "standard" or "R" length of damper rod, the longest?

Reason I ask is to get even more suspension travel for off road.

Also, since I have the attention, of those that know, are the cartridge inserts worth the extra $150 vs the $110 for progressive springs, if so, how come? Thanks guys this is like sitting in HD school for me.

 

R is longest, L is shortest and standard is in between.

 

Ok thanks