http://percentcalculator.com/?gclid=CO6a-v2ZmMkCFUVffgodmOECYg

3.43%

sounds more right?... ...

Did I mention I suck at math?... ...

jcstokes wrote on 11/17/15 at 10:36:05:

I don't think the unsprung weight conspires against handling, but it does take a heavier hand to drop it into a turn, and whether it's the weight or the diameter, I lost some top end / acceleration with it
I've had this before with anther bike, the stack tires on that one fell between metric sized (it was an older bike) and the PO went to the higher side (100/90 18)
when the tire on the front interfered with the fender though, I had visions of a full on unintentional stoppie, so I dropped to the lower side (90/90/18) and the bike started tipping in much better, so I minimized the rear, too, whole different bike
I think it's like a CD vs a Cassetter though, you have to get used to a CD and then re listen to a cassette to really get how much better the CD is
Personally, I need all the help I can get in the twisties

The more unsprung weight,.. the more inertia to fight with the suspension...
This means more time with less tire contact,... also, more weight for the engine to overcome in getting the bike moving...

...but,... more tire also creates more centrifugal force, giving more stability on the highway...

It's all about balance...  everything changes from parking lots to super-slabs... and all the curves in between...

Ain't nuttin' perfect... ...

The acceleration is affected both by the mass of the tire and the radius of the tire.

The formula for inertia of a cylinder is: I =1/2 mass x Radius squared.

So a heavier tire slows down the acceleration a bit by the extra weight, and also by the larger diameter.  The radius used is not the outside diameter of the tire - but the radius of the mass center of the tire profile.  For the larger/wider/heavier tire the radius is increased over the stock tire.

If you are not drag racing your Savage.....the reduced acceleration is most likely not an issue as you will still be able to accelerate with normal traffic you encounter on public roads.


The extra inertia of the larger tire that makes it accelerate a bit slower also makes it resistant to a change in speed and direction.  Braking will be just a bit slower.....mostly from the additional rotational inertia and a tiny bit from the extra weight moving forward.  The additional rotational mass will also make the bike a bit more resistant to directional change when initiating a turn or coming out of the turn.

Again.....this is not an issue unless you run timed events in the slalom course, or your buddies are leaving behind in the curves and won't wait for you at the next STOP sign.  The additional stability might even be a welcome change for some riders.

The bottom line is that if you use your bike as a Canyon Carver.....you might want to stay with the smaller tires that are available.  If you use your bike as a commuter or touring bike, the larger 140/90-15 might be a better choice.

Shinko I'm using is the 712, which may be a bit different than the 230
I could get up to 90-95 mph on the stock IRC, might hit 80-85 on the shinko
Of course there's a bit of speedo correction involved, but not, I think, a full 10 mph
as far as traction, it's a non issue on a bike as light and low powered as a Savage, the stock 140 / 80 (in a decent tire) has more traction than this bike really needs, and so does a 130 / 90, in a decent tire (no, IRCs are not decent tires  )
I've gotten used to the bike "humming' along at 70 since I moved out of town, so that's not an issue (I didn't see much of a change anyway)
Of course you went from a wore out IRC to the 230, so near anything is an improvement  
I might try the 230 next time, on your recomendation, if I don't go Pirelli MT66 (also budget priced and highly recommended, but not available in 140/90 I don't think)
stability has never been an issue for me on the Savage (except the crappy IRC tracking grooves like a slot car) I came off a Ninja 500, and before that a Rebel, neither as stable as the savage (wish I'd kept the Ninja, I could use it for a commuter and just use the Savage for easy ridin)
that bit of extra resistance in the steering puts me off a lot, though, and I'm slow in the tight stuff as it is (Captain Slow I am )

Mine rubbed like that too, at first, but not badly
A few cranks on the preload adjusters and a few miles and no more rubbibg