LeMans IV...

[Groover]

I'd be curious to know the offset difference as well. I know the newer ones have less offset, giving the more trail. Maybe that reduces turn radius, not sure. I know mine with the 16" requires at least 1.5 times more maneuvering than my G5. I think the turn radius is just short on those to prevent the fairing from hitting the tank and tank spoilers.

Here is a sketch I did a while ago when I was trying to figure out this change. The red shows the wheel and forks location with the original triples, the green is with the updated triples. Basically this sketch shows how offset plays into changing trail (in general)

[Denis]

Okay.  Mixed info.  The SPII would steer as quick as an LMIV with same set-up.  I have had no problems with mine and there are no cracks in the triple trees.  Seems that when the bike came out that some American riders like pounding the bikes.

I know that my LeMans had the triple trees updated to the later version long before I got it. I've never had any weird feelings from it since I've owned it.
Honestly, I think my SPII is quicker than the LeMans. Although both have 16/18, the 16" front wheel on the SP is .25" narrower than the one on the LeMans.

[Groover]

I'm guessing the handlebar and their mount point differences between the LM and the SP come into play on this.

[Tom]

Air pressure and size of tire too.

[Denis]

Yes to both, I'm sure! I've often wondered what the LeMans would be like with an SPII front wheel on it.

[wirespokes]

Thanks for the diagram, Groover. That certainly puts it out there in a simple way.

Yes, the turning radius is huge because of the steering stops limiting movement - fairing hitting the tank, bars/tank, etc. But once i'd gotten the tire situation sorted out, it's as nimble as any other bike I've owned. While I was trying to figure that out, I'd called Moto International looking for some original triples, which they didn't have. But Dave did tell me not to worry about the triples, the difference is so minute I wouldn't notice it.

I've never ridden any of the Guzzis with a 16" front, so have no comparison.