lets talk V4 steering head offset..
- Thread starter andyb
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I run as long a wheelbase as I can.
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Which tool have you got Andy?
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I copied the Barni racing one from a picture so my numbers won't compare to yours although the differences will be similar...
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When're you next on track? I'm at Snetterton on the 13th, and Cadwell on the 14th.
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Assuming they all leave the factory identical...
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So I compared 4 base 22 V4 (and two V4S) that were std bikes, using my ride height tool and they were all within a millimetre of each other. So std rear shock length(312mm), sprockets and chain lengths and all very new, meant that the eccentric would be in a very similar position.
I now have a number for the std bike and compared it to my own set up, a ohlins ttx set at 312mm eye to eye as per instructions, new chain and the linear rear linkage.
Mine was 5mm higher than the std bikes at the rear..
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So I compared 4 base 22 V4 (and two V4S) that were std bikes, using my ride height tool and they were all within a millimetre of each other. So std rear shock length(312mm), sprockets and chain lengths and all very new, meant that the eccentric would be in a very similar position.
I now have a number for the std bike and compared it to my own set up, a ohlins ttx set at 312mm eye to eye as per instructions, new chain and the linear rear linkage.
Mine was 5mm higher than the std bikes at the rear..
Interesting. Iirc, @RickD996 said he prefers the rear 5mm lower than standard. Are you gonna try lowering yours for comparison?
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well having sat on several others yesterday it does seem a bit tippy toey... so I am going to lower it down both back and front back to the std setting to begin with...
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That’s the thing … the rear eccentric goes up and then down as it is rotated clockwise with a lengthening chain … from lowest to highest is nearly 12 mm! Thats a massive impact on rear ride height with no way of compensating for it on a standard set up… even a 748 had ride height adjusters!
Interesting subject matter for me as I’m just beginning to get into suspension and geometry. You have the eccentric hub, and it’s effects on ride height, swingarm length, overall length. You have a ride height adjustor, you have variable geometry shock links, you have different front shock mount options, you have shock length. You start messing with this stuff and everything else has to follow.
I’ve been working with RoadracerX to get what I want/need. Very knowledgeable dude. I ended up making a few parts to make everything work together including my own preload spacer and ride height adjustor. My plan is to deep dive into this subject matter and really get into track riding. Very interesting stuff
I made this ride height adjustor for about 100 bucks. Aurora NAS rod ends, Ti nuts and 7068 aluminum body. Quite a bit less than DB, and Motocorse and I got quality parts and what I wanted. The bearings in a lot of those aftermarket adjustors are garbage.
I’ve been working with RoadracerX to get what I want/need. Very knowledgeable dude. I ended up making a few parts to make everything work together including my own preload spacer and ride height adjustor. My plan is to deep dive into this subject matter and really get into track riding. Very interesting stuff
I made this ride height adjustor for about 100 bucks. Aurora NAS rod ends, Ti nuts and 7068 aluminum body. Quite a bit less than DB, and Motocorse and I got quality parts and what I wanted. The bearings in a lot of those aftermarket adjustors are garbage.
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yep easy peasy on the 1199 1299...
the trouble with the v4 in the std set up is the cheap as chips flat dog bone bars on the outside of the shock mount. look at the RS set up and the shock bottom mount is on the outside with an adjuster central up to the swing arm.
in reality it needs a different bottom mount on the shock and a different rocker with the locations of the shock and tie rod swapped, and the swing arm machining to take a single tie rod end...it would be so simple I don't know why it wasn't done from std.
the trouble with the v4 in the std set up is the cheap as chips flat dog bone bars on the outside of the shock mount. look at the RS set up and the shock bottom mount is on the outside with an adjuster central up to the swing arm.
in reality it needs a different bottom mount on the shock and a different rocker with the locations of the shock and tie rod swapped, and the swing arm machining to take a single tie rod end...it would be so simple I don't know why it wasn't done from std.
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Does your bike have the same spring and preload as the other bikes?So I compared 4 base 22 V4 (and two V4S) that were std bikes, using my ride height tool and they were all within a millimetre of each other. So std rear shock length(312mm), sprockets and chain lengths and all very new, meant that the eccentric would be in a very similar position.
I now have a number for the std bike and compared it to my own set up, a ohlins ttx set at 312mm eye to eye as per instructions, new chain and the linear rear linkage.
Mine was 5mm higher than the std bikes at the rear..
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