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Discussion in 'Hacks' started by Get Back, May 25, 2009.
I've been pondering leading links for a while and have come up with the below sketch regarding the braking dive characteristics using a freely rotating calliper mount with tie rod back to the fork tube. I've ignored the mechanical anti-dive through the angle of the lower link in relation to overall centre of gravity. That will need another sketch.
OK so I went ahead and did a sketch for mechanical anti-dive through the angle of the lower link in relation to overall centre of gravity (COG). The larger the value of "Y" the larger the moment arm the COG has to act on the suspension during braking.
Larger "Y" = more brake dive.
Smaller "Y" = less brake dive.
And BMW effectively accomplished that with the Telelever..........
Yeah the BMW solution works on geometry too. Sometimes it doesn't work so well as you may have seen recently. It does have the advantage of maintaining geometry regardless of steering angle compared to leading link fork. Not all of us want to ride BMWs though
That is not how it works, according to:- Tony Foale, Motorcycle Chassis Design: The Theory and Practice. Check it out on line!
Is it available free online or a recommended book to purchase?
What in particular are you referring to Phyllis?
Anti-dive....and how it is worked out, and why!
" One often sees comments to the effect that Parallelogram designs remove all braking effects from the suspension, we can see that this is clearly not true."
This is a direct quote from Tony Foale.
How can you guys just make shit up? Tony Foale is an EXPERT in the field of motor cycle design and construction. Study his work and learn something!!!
(smiley face) Phyllis
Ah okay gotcha. I may be guilty in stating some of the things related to anti dive. It is true that floating calipers make a big difference in that area as opposed to a fixed caliper. However, nothing is a total absolute even though the overall effect is true. I apologise if I am the guilty one and will have to figure a better way to state the truths associated with floating calipers..........Yes, Tony Faole is one of very few true experts in a field full of so many that simply repeat what they have heard and he is highly respected . ..........................................................................Years ago he went to work with Sedgeway. He contacted us to build a roll cage prototype from some prints that were provided. In looking at the prints I had to turn down the project as they were very detailed and had a tolerance of like .0.10. I contated Tony and told him about this . His basic response was " You are kidding !! (I thought he was going to be dissapointed with us) ...Then he wet on to say " Send those prints back I am going to have a talk with drafting as there is no way anyone could expect to be able to hold that kind of tolerance. I mentioned it to them before but obviously they did not listen!" He was a little amazed and went on to talk about real world realities vs drafting room dreams. LOL. Quite a guy and, yes, highly respected by many for many years.