Do not put a 130 on their.I used to have a 120 avon venom and it was huge!110 is stock.I think my front radial is a 100.
I just put a brand new 120/90-18 front on mine and love it. it fills the front fender very nicely and is "around" .8" to .6" taller than stock size.
I've run 130's before and it fit fine but didn't really like how it handled. A little too quick on turn in for me due to the shorter heigth but that's really a matter of preference and riding style
Are these radials your looking at?
639mm equals 25.15"
633mm equals 24.92"
The stock size 110/90-18 runs around 25.7 to 25.9 depending on who makes it.
The Various 130/70-18's I was able to find numbers on are between 25.1-25.3
The 120/90-18 I run is 26.5"
These are bridgestones numbers but they should be "fairly" close for most mfg.'s tire.
Everyone has different ideas for sure but for me the bigger, heavier, taller front tire adds some "gyro" effect to the front end and helps the bike not grab onto every crack that runs down the road the same direction I am going.
The 130 helped add the same stability/resistence to grabbing the expansion joint but the shorter diameter made it turn too quickly for my taste. I know someone used to riding a sportbike all the time would probably feel completetly opposite about this though.
The tire sizes are going to effect your speedometer the following way (bear in mind these are averages using average mfg published diameters. Percentages are compared to stock)
120/90-18 That I run;Speedometer is going to read about 2.7% slower than real speed
130/70-18 633mm Diameter; Speedometer is going to read about 3.5% faster than real speed
130/70-18 639mm Diameter; Speedometer is going to read about 2.5% faster than real speed