170 80 15 vs 180 70 15 sprit 1100 - Honda Shadow Forums : Shadow Motorcycle Forum
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post #1 of 12 (permalink) Old 08-07-2017, 03:40 PM Thread Starter
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170 80 15 vs 180 70 15 sprit 1100

Ok have an 07 sprit 1100.. It is a starter bike for my son and a friend. They are having problems taking off. I believe part of it is this bike is geared pretty high I think. great for the highway but probably not when your just learning. Since you have to feather the clutch a little more when taking off.

So in a different thread I started it was mentioned by another member to change the rear tire to a 180 70 15. I was looking for some feedback from those hat have done this. The goods/bad if you will. Noticeable difference?? The 180 70 15 is about 3/4 inch smaller then the 170 80 15 (stock)

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post #2 of 12 (permalink) Old 08-07-2017, 11:36 PM
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The 180 70 15 is over an inch wider, how close is the 170 80 15?


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post #3 of 12 (permalink) Old 08-08-2017, 04:34 AM
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I ran the 180/70 on my 93 VT1100C

Loved it, mine was a 4 speed so it meant I didn't need to drop to third as often, pull a few more revs at 60mph but doesn't limit the top speed.... it actually had a higher top speed as it gained higher revs (didn't lug)


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post #4 of 12 (permalink) Old 08-08-2017, 06:15 AM
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I would say just keep practicing. I'm going to assume everything else about the bike is in good condition and works properly? Learn to operate the clutch properly. If they can't, heaven forbid they ever have to start while stopped on a hill!
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post #5 of 12 (permalink) Old 08-08-2017, 10:29 AM
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Quote:
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The 180 70 15 is over an inch wider, how close is the 170 80 15?
Actually the 180/70 looks less "filling" in the fender well compared to the 170/80. In the past folks used 200mm Metzlers w/o any issues.

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If they can't, heaven forbid they ever have to start while stopped on a hill!
With a passenger and a tall geared Spirit it does require a lot of finesse on a steep grade. As I mentioned in the other post, its quite a improvement but learning to ride it with stock tire size isn't a deal breaker either. I rode with stock size 27,000 mi. before the 180/70 change.




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Last edited by h13man; 08-08-2017 at 10:33 AM.
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post #6 of 12 (permalink) Old 08-08-2017, 07:54 PM
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One other thing I would look into, is does the 180/70 15 tire require a wider rim? Probably not a huge deal as it's obvious others have already done it. But, as much as possible, I find it to be a good idea to stick to what's recommended. If anything, since you'd also be changing the rake and the trail, to help make the bike easier to handle, I'd be more inclined to recommend a 150/90 15 on the rear.

Last edited by sidejam; 08-08-2017 at 07:57 PM.
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post #7 of 12 (permalink) Old 08-08-2017, 09:33 PM Thread Starter
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Isn't the overall size difference about 3/4 of an inch?? So the bike should only be 3/8 of an inch lower. correct?? Wouldn't a wider tire in back handle better?? When we are talking 1 inch wider that's only 1/2 inch per side?? Heck I hear different brands could very that much.. Not sure it would be worth it at this moment since I just had new tires put on it. (Stock size)

I do agree they need to learn how to work the clutch but it's not to fun killing the bike all the time.
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post #8 of 12 (permalink) Old 08-08-2017, 09:57 PM
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???

How old is your son and his friend? Not sure that the back tire will make that much of a difference. May just be a learning curve. Do they have any riding experience? How does the clutch do when you ride it? Could it be a problem with the clutch like broke springs or broke plates? Could the bike have aftermarket clutches and clutch springs in it like Barnett? I know I have too many questions. There's too many unknown variables.


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post #9 of 12 (permalink) Old 08-08-2017, 10:59 PM Thread Starter
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Bike has 8500 miles. Clutch is good believe to be stock. Cable adjusted properly. Age 17 rode dirt bike around 8 and 10 but not after that . To me it just seems like the 1st gear is tall. Or like your taking off in 2nd. I can ride it no problem. Also thought about putting in stronger clutch springs but the clutch does not slip. So I don't think that would change much..
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post #10 of 12 (permalink) Old 08-09-2017, 02:55 AM
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Quote:
Originally Posted by sidejam View Post
One other thing I would look into, is does the 180/70 15 tire require a wider rim? Probably not a huge deal as it's obvious others have already done it. But, as much as possible, I find it to be a good idea to stick to what's recommended. If anything, since you'd also be changing the rake and the trail, to help make the bike easier to handle, I'd be more inclined to recommend a 150/90 15 on the rear.

would the 150/90 15 not be pretty much the same diameter as the 170/80?.... so no change in gearing to speak off?

150x 90% = 135
170x80% = 136
180x70% = 125

If you are worried about rake you can slide the forks up the clamps a little to get the same rake back, I didn't and it handled very well.



My Bike before and after , Any day spent on the bike is a good day
VT1100C Shadow (1993)
VT750 Aero
TRX300 (Hunting Quad)
DRZ400E (my dirt bike)

For the kids to use
XR250
Rm80/Honda125 (1972 TL engine )
GN250
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