Ohlins fork cartridge demo, you tube

[erik]

Ohlins have made no mistake with the intent of that top out spring. Indeed we have done a lot of testing with various rates and engagement lengths and the effects are very interesting. Different rates and lengths will require a varying amount of main spring preload and I think that is where confusion possibly lies.

I'm sure Ohlins have got it right, I'm just saying you're incorrect when you said that the top out spring lessens the effective spring rate.
The first graph from the previous link I posted:

The spring rate is equal to the slope of the line and you can see the slope in the bit where the top out spring is effective is steeper than the slope after the top out spring (for both the blue line showing the long top out spring and red line showing the short top out spring). If the force in the top out spring alone was graphed, it would have to be drawn below the x-axis since it acts against the main spring. The line for the blue top out spring would slope up and hit the x-axis at position 0 where it would stop (since the suspension is compressed enough to be off the top out spring).

[Pumba]

What a great vid, would love to see more

[Robert Taylor]

I'm sure Ohlins have got it right, I'm just saying you're incorrect when you said that the top out spring lessens the effective spring rate.
The first graph from the previous link I posted:

The spring rate is equal to the slope of the line and you can see the slope in the bit where the top out spring is effective is steeper than the slope after the top out spring (for both the blue line showing the long top out spring and red line showing the short top out spring). If the force in the top out spring alone was graphed, it would have to be drawn below the x-axis since it acts against the main spring. The line for the blue top out spring would slope up and hit the x-axis at position 0 where it would stop (since the suspension is compressed enough to be off the top out spring).

Lets put it another way, it allows more preload ( compressed spring force energy is higher at top of stroke ) and counteracts a negative by-product of that preload. Also if we fit firmer springs we counter-balance that with firmer top out springs. I will try and find some Ohlins literature on that subject but it will take a bit of digging.

[Robert Taylor]

I'm sure Ohlins have got it right, I'm just saying you're incorrect when you said that the top out spring lessens the effective spring rate.
The first graph from the previous link I posted:

The spring rate is equal to the slope of the line and you can see the slope in the bit where the top out spring is effective is steeper than the slope after the top out spring (for both the blue line showing the long top out spring and red line showing the short top out spring). If the force in the top out spring alone was graphed, it would have to be drawn below the x-axis since it acts against the main spring. The line for the blue top out spring would slope up and hit the x-axis at position 0 where it would stop (since the suspension is compressed enough to be off the top out spring).

Actually I have just twigged the mistake, the word rate should not have been in that text, it should have been spring force.

[Squiggles]

Interesting watch, yes please to more...

But one request, can we have someone like this in the background next time? Surely that'll help the sales

[Hidalgo]

Both are stunning

[Ozzy27]

I'm sure Ohlins have got it right, I'm just saying you're incorrect when you said that the top out spring lessens the effective spring rate.
The first graph from the previous link I posted:

The spring rate is equal to the slope of the line and you can see the slope in the bit where the top out spring is effective is steeper than the slope after the top out spring (for both the blue line showing the long top out spring and red line showing the short top out spring). If the force in the top out spring alone was graphed, it would have to be drawn below the x-axis since it acts against the main spring. The line for the blue top out spring would slope up and hit the x-axis at position 0 where it would stop (since the suspension is compressed enough to be off the top out spring).

Yes erik you are correct that the rate of change per mm is greater where the top out spring is engaged. But the actual force required to compress the fork to the same displacment is less than if the top out spring was not fitted thus giving the effect of a greater displacment for the equal amount of force. (sudo softer action) Which helps a lot with side grip while leant over in a corner.
You would really need to graph with and without top out spring to get the full understanding.

[t3mp0r4ry nzr]

nice tools and crafty product placement!
very informative. Well done

[Sparky Bills]

Great idea Robert!
Keep em coming.

See you at the track

[Robert Taylor]

Yes erik you are correct that the rate of change per mm is greater where the top out spring is engaged. But the actual force required to compress the fork to the same displacment is less than if the top out spring was not fitted thus giving the effect of a greater displacment for the equal amount of force. (sudo softer action) Which helps a lot with side grip while leant over in a corner.
You would really need to graph with and without top out spring to get the full understanding.

Thanks Chris for clarifying. When you change the rate of the top out ( or the main ) springs that alters the preload requirement and therefore as you say the force required to achieve the same displacement, and therefore also ride height. Which is also juggling around with trapped air spring compression ratio. The physics on paper are interesting but in the end event you have a box of toys and you test them.
Does anyone want to purchase any of our top out spring options?

[Robert Taylor]

Interesting watch, yes please to more...

But one request, can we have someone like this in the background next time? Surely that'll help the sales

Ill work on that, but I thought it was my sultry voice that was the big hit!!!!

[sinfull]

Interesting watch, yes please to more...

But one request, can we have someone like this in the background next time? Surely that'll help the sales

One of two things here !! You either aint seen Sandra change into her leathers or you are gay ?

[Squiggles]

One of two things here !! You either aint seen Sandra change into her leathers or you are gay ?

I've seen her but a fur coat worn as such isnt nearly as appealing!

Edit: Perhaps imagination improves with age

[sinfull]

I've seen her but a fur coat worn as such isnt nearly as appealing!

Edit: Perhaps imagination improves with age

I guess it would if you remain a pimply faced hard done by perve aye !

[skypig]

Are the MX ones similar? Available for YZFs , do you know?