Silvio 2.0 Seat Angle and Rear Suspension

[Ivan]

I was thinking that adjusting the rear suspension of Silvio 2.0 would also affect the seat angle. How much would this change the seat angle and would it be significant for those wanting to tweak this angle? Below are my data and measurements.

Conclusion: The seat angle changes from 27.0 to 27.4 to 27.8 deg in the low, medium, and high positions. This range is therefore probably not significant enough for those wanting to adjust the seat angle.

Note: When I was adjusting the disc, I completely removed it so I could see the suspension block. Only did I see that it was "stuck" in the threads. Putting my full weight on the frame resulted in one side of the block moving but another side getting stuck as you can see in the picture below. If this happens, moving the adjustment disc will not have any effect on the suspension. To resolve this, I dripped some soapy dishwater in the recess, and carefully pried the edges of the suspension block so the water could seep in.

 

[BentBierz]

I didn't use any soap but it

I didn't use any soap but it certainly would have made it a little easier. To install mine, I used a shop clamp I have with big, rubber protectors on it that pressed the suspension block in squarely and fully seated.

 

[romelman]

shop clamp easiest

yes, I also used a clamp to compress the rear shock, very easy with a clamp...

 

[Doug Burton]

Very nice analysis, Ivan...

I love quantitative analysis. A fine job you did.

The cool thing about "rubber" parts is that they find their own best configuration as they are worked in use.

So you have produced real data to show that the rear suspension adjustment is about "spring" stiffness rather than ride height and seat angle, as John intended in the design.

Soap, water, Windex - can help with installing the elastomer, but at the end of the day, ride dynamics are unaffected other than rear suspension softness, and that within the intended range. That was the intent of the design.

Good onya, Ivan, Thanks.

Best,

Doug

 

[Jeremy S]

I still don't understand why

I still don't understand why the fit is so tight... seems like assembly and adjustment would be much easier otherwise.

 

[John Tolhurst]

Yes, it would be easier if I

Yes, it would be easier if I had made the elastomer a bit narrower. Next time.

 

[Ivan]

Thanks Doug! I made her nice

Thanks Doug! I made her nice and soft and she treated me well tonight on my ride. I am reporting on my build thread... I am super happy with the ride!