100/80/18 vs 110/80/18 front

[rphillips]

My GSX1100G is ready for a front. It calls for a 110/80/18. I have two new 100/80/18's in the garage, A Pirelli & a Continental. If I put one of these 100/80/18's on my bike, will I notice any difference? I know the book calls for a 110, & many folks don't like to deviate, at all, from the book, but my question is will I even know it's a 100/80/18 if I didn't read the #'s stamped on the sidewall? Thanks

[Gorminrider]

The problem is that a narrower tire on a wider rim neccessarily has to flatten itself a bit.
ADD TO THAT more:
the actual measure of the tire size you want to use means 80 mm "high" if it were on a rim it's intended for..... more room under the fender I guess. The original would be 88mm high...
But combine this flattening to the already slightly squashed tire and... well...

Possibly relevant notes I have about putting Lower profile tires on indicate it's a little scary to me: paraphrased , they are ok for very experienced users . They have better grip until they lose it, when they lose it QUICKLY. A rounder tire is more forgiving. I can sort of imagine this pretty easily...tires are great on the straight-ahead but curve quickly towards the sidewalls so when you are leaning round a corner it's on a very sharp radius.
If I'm right, I don't think it'd be worth the saving. On a motorcycle the tires are very, very important...Save $ somewhere else. Or, go very, very carefully....

Add: I'd guess it'd be about a 12% "difference" in "feel" as per noticing it. Not so much really but It's where and when you might notice it that sets off the nervous nellies like me. Tennessee has hills? lots of curves?

[derwood]

https://tiresize.com/calculator/

this works to compare sizes

[Steve]

1. the narrower tire will steer quicker
2. the narrower tire is also shorter, and will increase the speedo reading
3. the narrower tire will have a lower weight rating

Are your two tires in the garage really "new"? They may have been recently purchased, but check the date codes.

I would not intentionally buy a smaller tire than specified, but if you already have the smaller tire and nothing else to use it on, go ahead.

.

[Gorminrider]

you will want a little more air in them than what you are putting in the originals, I think.