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steering geometry

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Brucey View Drop Down
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    Posted: 11 September 2019 at 4:37pm
went a bit OT in the 2019 battle mountain thread.  Found the illustration below,  but does anyone have comparable data for bicycle tyres?


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GeoffBird View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote GeoffBird Quote  Post ReplyReply Direct Link To This Post Posted: 11 September 2019 at 4:52pm
I think that is called 'tyre cornering stiffness'. Bicycle tyres aren't designed to take lateral loads so tyre manufacturers are unlikely to have data. I don't know of any tests by HPV enthusiasts.
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Brucey View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Brucey Quote  Post ReplyReply Direct Link To This Post Posted: 13 September 2019 at 10:26pm
it occurs to me that even if you did take the above  into account and therefore obtain the highest lateral force, when riding an HPV this still might not be fastest way round the circuit. 

The reason for this is that you don't have unlimited amounts of power available, so if you increase lateral grip by 1% but it comes at a cost of a similar percentage increase in drag (which it might if you are exploiting a high slip angle), it might end up being a net loss, vs using that energy at some other point around the circuit.

Of course if the choice is braking into a turn a bit less, a higher cornering speed is more of a no-brainer, but if you end up pedalling through turns any drag increase isn't such a good idea.

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Post Options Post Options   Thanks (0) Thanks(0)   Quote GeoffBird Quote  Post ReplyReply Direct Link To This Post Posted: 15 September 2019 at 4:37pm
Yes, this is why Chris told me that maintaining Ackermann geometry is important. Rolling resistance is very bad when  you have 0.25 bhp!
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