On that V4 SF the inserts are marked 26.5 +2 mm. So I'm assuming they're losing 2 mm of trail per degree. I agree sounds like too little of a trail change. The 1198's are also 24.5 and 96mm. They like to shake the head when the front tires skimming the pavement over 100 mph.
Steering head inserts and ~Rake angle
- Thread starter andyb
- Start date
Joined Aug 2020
3K Posts | 1K+
northampton
yes narrow track forks and 36mm std offset
reading from the Corse list of available options, im interpreting it as 26.5 rake with 2mm offset of the steering spindle thats added to your wheel base
+ as in forwards towards front wheel
- as in toward the radiator
The number I get for the change of wheelbase when the head gets kicked in 2 degrees is real close to 0.800 inch. If this number sounds familiar its because 20 mm is the difference in the wheelbase of the SF vs the Pani.
It would have been nice if Ducati told the truth about the SF. If you consider that 24.5 degrees gives you 100 mm then every degree give you about 4 mm more trail. So the 26.5 inserts on the SF's give about (?) 110 mm of trail. Which is what they feel like steering wise.
Andy when I reassembled the bike I pulled the fork caps so I could measure the distance between the wheel and the radiator support. With 2 lines on the fork showing, at full collapse the tire is about a c**thair off the radiator support. I don't think you can run the head at 23.5 degrees (96 mm trail?) without some other changes.
Joined Aug 2020
3K Posts | 1K+
northampton
Nice. I was going to suggest boring the stock ones and sleeving them. Post pictures of the finished parts. I would also like 24 degrees but raising the rear 0.5 inch gets you about a half degree. And i want the anti-squat back like it was. Since the wheelbase shortens about 0.2 inch per half degree it will be interesting to see if these get you into the radiator support. That cut-out radius in the support is actually pretty far from the radiator itself so if this needs to be depth adjusted it should work out. I assume you're making multiple sets?
So not only are these 24
They are also offset 5mm forward
So when I add the offset yokes and increase the trail through them the clearance won’t be an issue…..
Ok. Perfect. So you increase the wheelbase back the 5 mm (0.200 inch) which should stop any interference with the shroud. In a stock bike (no adjustable yokes) this should give 98 mm of trail. This would make a stock bike feel like it had a CF wheel on the front. I wish you had started this earlier when I had my bike apart.
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