22+ V4 chassis geometry

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bp_SFV4 said:
Spec as in measurement given in the manual. I know that shows to the top of the fork cap, but it also depicts Showa forks.

I thought roadracerx advised someone with a 2021 to set the forks so 10mm of anodized tube above the top clamp. If you’re doing 14mm to the top of the cap, that’s probably similar.
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10 mm was stock for my bike after talking to a member from Germany who talked to a Ducati tech and said stock fork height was 248 from lower triple. 14 mm would be 252. I’d highly recommend looking into getting your bike to have 99 mm trail.

After 2 years dialing in my suspension, I’m finally able to easily lean the bike over. I was comfortably running 48s albeit with the worry of the bike overheating and possibly spitting me off it. I think if I threw on fresh rubber (currently running DOT SC3s with 3 days on them) and pushed I’d be down into the 45s.
 
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I am just going to leave this here, SD you need to chill with with the geometry waffle until you are A. on slicks and B take your training wheels off.
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Paul G said:
I am just going to leave this here, SD you need to chill with with the geometry waffle until you are A. on slicks and B take your training wheels off.
View attachment 56771
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I don’t mind a little chicken strip. No need to lean the bike over more than necessary. It’s a trackday not a race. Majority of people probably excessively lean their bike over with no benefits.

Until you nut up and post lap times from your most recent trackday, I don’t think you have a leg to stand on. Also, you could get ...... if you don’t like what I’m posting
 
Shifting perspective here...if SD wrenches on his bike after researching the topic and arrives at a conclusion he feels is better, who cares?

Maybe more, or faster, or more forceful initial bar input would get him to the same place, but if it's more enjoyable to ride in the left right limits of how he rides it, who gives a ....?
 
Paul G said:
I am just going to leave this here, SD you need to chill with with the geometry waffle until you are A. on slicks and B take your training wheels off.
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I saw that, can’t understand it as it has the ‘magical trail figure’ but really can’t be arsed with the bollox talked

Sure if you say it feels better great..but cut the .... with pie in the sky numbers and calculations.
 
andyb said:
I saw that, can’t understand it as it has the ‘magical trail figure’ but really can’t be arsed with the bollox talked

Sure if you say it feels better great..but cut the .... with pie in the sky numbers and calculations.
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You “can’t be arsed with the bollox talked” but you’re literally talking bollox? 🤦‍♂️

I’d say I have better body positioning and flexibility than you decrepit old fat ..... and therefore don’t need to lean the bike over. It means I have plenty in reserve.

And I wouldn’t say it’s a “magic number” rather the specs that Ducati set at factory aren’t exactly correct. Ducati claims 24.5° equals 100 mm trail. This is incorrect. Trail is around 105 mm with the an SP V4 (claimed 302 mm tire radius). In reality, tire radius is probably around 298-300 depending on pressure which would equal trail of 103-104 mm. To get to 100 mm trail w 24.5° rake and 30 mm offset, the tire would need to be 292 mm in radius (584 mm diameter). A DOT SC3 at 28 psi is 296 mm which is allegedly the same profile and size as a SC SP V4. Does Motospec say the same thing? Because I’m pretty sure it does.

Again to all you talking ...., let’s see your lap times. I’d bet that we’re all a few seconds from each other.
 
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There is theory and practice is the point I am making, i.e get out there and do laps, adjust a setting and see the difference. I dont like calling them chicken strips but you are leaving a lot of lean angle, grip and corner speed on the table. Moreover you are not on slicks so not extracting the max out of the bike to discover the edge of the envelope where these fine adjustments matter a lot. If you like faffing around with rake and trail on a bike that is well set up straight out of the shop good for you but it seems a bit of a intellectual exercise that will do about zero for lap times. I can understand if the bike has a trail issue like the 1098's or if you are at the sharp end and you're changing steering angles etc for individual tracks.but that is not the case.
 
Paul G said:
you are leaving a lot of lean angle, grip and corner speed on the table.
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This is on purpose.

If you're relying on slicks for lean angle, grip, and corner speed you're doing it wrong. Also, if one doesn't have confidence on the front end why would you then push more more lean angle? That seems like a recipe for disaster. Now that I have good feeling at the front, maybe I can now lean the bike over more.

If you like the bike with the stock trail, good for you. But that stock trail is not 100 mm as Ducati claims. I prefer a trail that is ACTUALLY what Ducati claims. Move along
 
Before anyone says anything, I realize that GP bikes are vastly different than street bikes but getting ergonomics right are basic adjustments that everyone should do... So far, I haven't been able to get a good riding position on track

I did a little more digging into ergonomics on the V4 especially for someone around my height. Took a look at Pedro Acosta (5'7") and Jorge Martin's (5'6") bike contact points and overlayed them on to the V4. GP riders run a significantly higher clip-on position (relative to the seat) with more downward bar angle and less sweep. The V4 bars are positioned just above the seat and this is what gives that wrist-y feeling. Notably the Honda ergos are more like the GP bikes with much lower seat and higher bar position (not as extreme though) compared to the V4.

It's not surprising why it's more work to ride the V4 on the track when looking at the riding position. Still need to put that top triple that'll gain me 4-5 mm. And I'll also put less sweep in the bars. It's a shame the tank is so tall too.

Panigale-V4-S-MY22-Model-Preview-1050x650-V06.jpg
KTM ergos.jpg

GP24 ergos.jpg
 
Did you ever measure your rear shock length? In my notes I have 310mm and 312mm for the V4R. The 2mm longer shock length is 4mm more ride height and I think 1mm less trail?
 
?

The measurements I have came from Ohlins. The V4R value is also listed in the V4R service manual. The V4S service manual doesn’t list it.

I’m not aware of any differences model year to model year with the V4/V4S.
 
Per KarlKani aka JohnSmith's MotoSpec numbers, the 22 V4S shock length should be 310. 22 V4S and 23 V4R have the same rake and trail per Ducati's tech specs at 24.5º and 100 mm. They also have the same seat heights. But again, what Ducati publishes has rarely been accurate.
 

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