don handshy
Member
Am trying to find a taller, radial front tire. Would also go with an 18" front wheel, if they exist. Has anyone gone taller in the front?...thanks don
Taller front tire/wheel
- Thread starter don handshy
- Start date
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I believe the C10 Concours has an 18" front. But why? There are far more 17" choices when selecting new rubber than 18" choices.
C&C
Well-known member
We see a lot of arbitrary modifications without reason, i.e. larger rear tire, car tire on the back, and now 18 incher up front. I'm thinking if you're going to ask, you might at least state a reason why. So, Why?
Capt. Bob
Bilge pump. A novel idea.
Do a lot of ridin' in the dirt do ya?
RAVENRIDER
Well-known member
Richouse
Well-known member
I'm wondering if it will even fit under the fender.... and I still wonder why also????
NMRoadRunner
A Bulls work is never done!
WhyTF :blink:
v65
ouch
18 is no 2^4, but at least it's not a prime number like that bastard 17. :angry:
don handshy
Member
there are many valid reasons for tire alterations. car tires will give many, many more miles, albeit with some degraded handling. taller or shorter rear tires can give up to a 5% change in gearing. taller or shorter front tires can either slow down or quicken handling. I am looking to slow down the front end handling a bit. would like to find a 120/80-17 V or Z rated radial but cannot find one. I have found a 130/70-17 VR that I will go with @ my 1st tire change. this tire is ~1/2" taller and ~3/8" wider and will fit beneath the fender with room to spare. there are more 18" choices than 17" actually....don
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Special_K
Member
Do you believe that thousands of engineers toiling away at motorcycle manufacturers, just throw darts at random numbers pinned to the wall to decide on wheel/ tire size combinations?
I'm all for some experimentation, but the first number in a tire designation is width, the second sidewall height. You're above sizes are wider, not any taller than the 120/70-17 stock size.
Some of the wing guys are running rear tires on the front for some of the reasons you mention. Avon makes a 140/80-17 that could be used in this manner. It's both taller and wider than stock. ST-46 link
I am curious though, have you played with tire pressure at all? Which begs the question; What pressures are you running now?
charismaticmegafauna
Well-known member
Not quite.... The first number is the width -- but, the second number is the aspect ratio (or, the ratio of sidewall height to width).
A 120/70 has a sidewall height that is 70% of 120. A 130/80 has a sidewall height that is 80% of 130 -- considerably taller.
I'd suggest being very careful going down this road (actually, I'd suggest not doing it) -- front and rear m/c tires can be very different (you may need to reverse the direction of rotation, at the very least?).
You become the engineer (and test-rider)....
FJRay
Well-known member
As this continues somebody is going to jump in and tell you that your balls will fall off if you try this. Just a warning.
don handshy
Member
actually I am an Engineer. more over, Ive owned over 3 dozen bikes in my life and have been riding over 42 yrs. Ive also logged over 400,000m/c miles. a 130/70-17 tire is indeed both taller and wider than a 120/70-17 tire. a 140/80-17 however, would not fit beneath the fender. a 120/80-17 is the target fit and I cant find any V or Z radials in that size.....don
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SLK50
Well-known member
A much simpler solution would be fitting a 190/50 rear tire. This would lower the rear about 1/4" and have the effect of slowing down the handling. Actually, without any suspension changes, this would make the handling considerably "heavier" and you may find yourself running quite a bit wider in turns, especially right handers, until you learn to compensate.
The FJR seems particularly sensitive to tire choice, perhaps merely a change in brands may have the desired effect?
don handshy
Member
thanks for the suggestion...will go with either a 190/50ZR-17 or a 160/60ZR-17(BT021) AND a 130/70VR-17(G850) front. thereby bringing the front and rear tire diameters to within ~.300" of each other, instead of the 1.200" differential that exists with the stock tire combo...thanks again all...don (note: a 120/80-17 front and a 160/60-17 rear are the same diameter 24.56")
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Well then, in that case, check your air pressure, ride for another 10k and get used to the bike, then get back to us.
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