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2292 Views 38 Replies 8 Participants Last post by  JK_DILLA
Who rides a 120/70/17 front tire on their Sv? I know track guys with one have to if they want decent rubber, so does it change much or can you tweak a few things to make up for it?
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jeeps84 said:
The brand has allot to do with it. Some have a round profile while others have a sharp profile.
:withstupi that's what I was getting at earlier in the thread.
jeeps84 said:
The brand has allot to do with it. Some have a round profile while others have a sharp profile.
True. Metz's are more round and Mich's are more pointy
Wait a second. Looking at the sidewall aspect ratio in Gasman's tire tech link, the height of the sidewall in the 120 60 tire will be .6 times 120 or 72mm. The height of the 120 70 tire will be .7 times 120 or 84mm. So the 120 70 tire will be 12mm higher, which raises your triple clamp 12mm. To lower the triple clamp 12mm, you have to raise the fork legs 12mm or about 1/2 inch higher in the triple clamp.

That seems like a lot to me. I would measure the height of your axle off the ground with your stock 60 tire and then measure it with the 70 tire. The difference is what I would raise the fork tubes.
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DLITALIEN said:
True. Metz's are more round and Mich's are more pointy
my metz was a POS!!!!
No Worries said:
Wait a second. Looking at the sidewall aspect ratio in Gasman's tire tech link, the height of the sidewall in the 120 60 tire will be .6 times 120 or 72mm. The height of the 120 70 tire will be .7 times 120 or 84mm. So the 120 70 tire will be 12mm higher, which raises your triple clamp 12mm. To lower the triple clamp 12mm, you have to raise the fork legs 12mm or about 1/2 inch higher in the triple clamp.

That seems like a lot to me. I would measure the height of your axle off the ground with your stock 60 tire and then measure it with the 70 tire. The difference is what I would raise the fork tubes.
Good call. I'll have to remember to do that once i get my new rubber.
No Worries said:
Wait a second. Looking at the sidewall aspect ratio in Gasman's tire tech link, the height of the sidewall in the 120 60 tire will be .6 times 120 or 72mm. The height of the 120 70 tire will be .7 times 120 or 84mm. So the 120 70 tire will be 12mm higher, which raises your triple clamp 12mm. To lower the triple clamp 12mm, you have to raise the fork legs 12mm or about 1/2 inch higher in the triple clamp.
i did that math last night, how did i end up with 16mm?!?!?!?!?

NW said:
That seems like a lot to me. I would measure the height of your axle off the ground with your stock 60 tire and then measure it with the 70 tire. The difference is what I would raise the fork tubes.
:dthumb:
NW... I would say that you would only have half of that change!

Think about it... 50% of the raise would be on each end of the tire.. So you really should only have to raise the forks up 6mm in the tripple and you should look into raising the front fender up a few cause the tire would be taking up 6mm more in the space cushion between the tire and the fender.

And (I can't remember, but I'm pretty sure) sense the SV speedo is drivin off the front wheel this is going to throw off the speedo!! You will be going faster than indicated!
120/70 17 tire on an SV650

i finally put on a 120/70 17 Pilot Power on the front of my SV. It fits nice and snug and looks like it was supposed to be there in the first place. Anyway, once on I immediately dropped it 10mm which seem to be the starting point i hear the most. Tire felt awesome, no doubts there, but steering was heavy and feel was real numb. Went back and dropped it 2mm more to a total of 12mm drop. NoWorries was RIGHT ON because at 12mm the bike had all its feed back again and was much quicker to steer, fall over, and control than before. Its like a whole new bike! If anyone is thinking about switching tire sizes i would recomend it here. Keep in mind that this in on a 02 SV650 with stock rear shock/ rear ride height and 160/60 17 rear tire.
I went to a 120/70 for the first time 2 weeks ago. It took me a whole day of riding at the gap to get use to it. I like the 120/70 a lot more over the 120/60. I can really manover the bike a lot faster and get down a lot lower with the 120/70.
That guy NW... knows his stuff!
Gas Man said:
That guy NW... knows his stuff!
yes he does. I tried to give him some rep ponts but it kept saying error on page. WHAts that?!?!
There is a bunch of threads on this over at svrider. You have to readjust a lot of stuff to get it run correctly. Readjusting the front height, then you have to mess with the rear and all sorts of other ****. Suspension seems to be the place you can really gain the most out of a SV. Stock apparently blows chunks.
VolEngineer said:
There is a bunch of threads on this over at svrider. You have to readjust a lot of stuff to get it run correctly. Readjusting the front height, then you have to mess with the rear and all sorts of other ****. Suspension seems to be the place you can really gain the most out of a SV. Stock apparently blows chunks.
yeah, thats why i said that the rear was stock. When i get new springs in the front and new shock in the back, i'll surely need to readjust. But thats the fun of it. Getting it setup to where it fits YOU. I take most suggestions as good starting points.
JK...we are working on the rep points problem.
Gas Man said:
JK...we are working on the rep points problem.
appreciated. NoWorries dont worry, i'll get 'cha.
JK_DILLA said:
appreciated. NoWorries dont worry, i'll get 'cha.
wasnt untill i posted this that i realized how silly it was... because NW wouldnt worry anyway..... because he has no worries..... 'cause hes NW.... without worries...... yup, nope.
R1up0n1 said:
I went to a 120/70 for the first time 2 weeks ago. It took me a whole day of riding at the gap to get use to it. I like the 120/70 a lot more over the 120/60. I can really manover the bike a lot faster and get down a lot lower with the 120/70.
Only two weeks ago? You've had your R1 for a lot longer than that. It didn't have the 120/70? Did that guy change it? That's the stock tire size.
JK_DILLA said:
wasnt untill i posted this that i realized how silly it was... because NW wouldnt worry anyway..... because he has no worries..... 'cause hes NW.... without worries...... yup, nope.
I'm just amazed at how long this thread stayed on topic...until this of course. It's all good though. I don't give a ****.
DLITALIEN said:
Only two weeks ago? You've had your R1 for a lot longer than that. It didn't have the 120/70? Did that guy change it? That's the stock tire size.
thats what i was thinking. 120/60 17 is an odd size these days. especially on an R1.
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