Pics - Upsize & Stock Tires (Side by Side) - Page 2 - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #11 of 67 (permalink) Old 11-17-2011, 09:11 PM
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I have ME880s, but in the stock size, which IMO are already two big, especially the rear. My Harley Road King has a 130/90-16 rear tire, but the outside diameter is no bigger than the 150/90-15 on the Vulcan, and it is noticeably narrower. The stock rear tire on my 1985 Goldwing is the same as the Vulcan 750, 150/90-15, but the GW is way bigger. The 150/90-15 just looks out of proportion compared to the size of the Vulcan. I think the 130/90-16 would look much nicer. To me, the sidewall on the Vulcan's rear tire just looks too wide, like something that goes on a dragster. One of the things I loved about '70s bikes were the narrower tires and larger diameter rims, especially the rear. I also like the look of the Mean Streak, with it's 17" diameter rear rim and narrow sidewall. To bad it has to be so slow. Kawasaki should have put an inline four in it.

I am a motorcyclist, NOT a biker.


1997 Vulcan 750, purchased about a week ago
2006 Sportster 1200 Low
2013 Royal Enfield Bullet 500, converted to carb
2001 Yamaha XT225, heavily modified
2004 Honda Rebel 250
1979 Vespa P200E
2002 Vulcan 750 parts bike
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post #12 of 67 (permalink) Old 11-23-2011, 01:04 AM
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This post was super helpful in me picking the size of my new tires. Up-sized all the way around for me.

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350
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post #13 of 67 (permalink) Old 11-06-2012, 01:36 AM
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Nice write up on the different sizes. Will you be providing some pics when they are installed on the bike for a reference as well? Thanks.

Last edited by TSmith68; 11-07-2012 at 12:29 PM.
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post #14 of 67 (permalink) Old 11-07-2012, 01:06 AM
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My apologies again slim.

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post #15 of 67 (permalink) Old 11-07-2012, 07:20 PM
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no problem, thanks for fixing your post
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post #16 of 67 (permalink) Old 12-04-2012, 07:32 PM
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Ok, I need to learn up here before I get a ticket. I just upgraded from stock to 110/90-19 in the front and 170/80-15 in the back. I notice the revs are higher now and I thought they were supposed to be LOWER. I must be speeding all over the place or something is wrong. How far off is my speedo?

Thanks in advance,

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post #17 of 67 (permalink) Old 12-05-2012, 05:58 AM
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The speedometer is read off the front tire so the rear doesnt change it at all, just the engine rpm's per mph. On the tire size, the first number is the wideth is millimeters, second is the tire height is mm's, third is the wheel size in inches. The second number on the rear went lower which means you put a smaller diameter tire on, hence raising the rmp of the rear tire as the front stays the same. The wider the tire the lower the height is regardless if the wheel wideth stay the same. But as for the how far off is the speedometer, mine is 5 mph off at 55 acording to my GPS.

Last edited by Chuck A.; 12-05-2012 at 06:09 AM.
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post #18 of 67 (permalink) Old 12-05-2012, 11:05 AM
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Quote:
Originally Posted by Chuck A. View Post
The speedometer is read off the front tire so the rear doesnt change it at all, just the engine rpm's per mph. On the tire size, the first number is the wideth is millimeters, second is the tire height is mm's, third is the wheel size in inches. The second number on the rear went lower which means you put a smaller diameter tire on, hence raising the rmp of the rear tire as the front stays the same. The wider the tire the lower the height is regardless if the wheel wideth stay the same. But as for the how far off is the speedometer, mine is 5 mph off at 55 acording to my GPS.
Thank you - ok well in Deuce's picture the back 170 looked a hair taller than the 150 - so my confusion must be coming from that 5mph you informed me about. I think that clears it up! Thanks again!

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post #19 of 67 (permalink) Old 12-05-2012, 03:07 PM
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On the speedo drive wheel, whenever you gho a larger OD, it will lower your read MPH...ie the tire makes fewer rotations to travel the same distance. A slight increase in OD on the VN would probably compensate for the existing error, but going TOO large an OD would cause the speedo to read slower than actual.
I used to stop by local area speed trap officers and ask em to clock me....once at 30, once at 45, once at 55....most local cops will do it for ya.



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post #20 of 67 (permalink) Old 12-05-2012, 03:58 PM
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Quote:
Originally Posted by Wolfie View Post
On the speedo drive wheel, whenever you gho a larger OD, it will lower your read MPH...ie the tire makes fewer rotations to travel the same distance. A slight increase in OD on the VN would probably compensate for the existing error, but going TOO large an OD would cause the speedo to read slower than actual.
I used to stop by local area speed trap officers and ask em to clock me....once at 30, once at 45, once at 55....most local cops will do it for ya.
Hmmm..... good idea asking the local boys to hit me with radar. Thanks!

My main issue here in moving to bigger tires is getting lower RPMs at the same speeds (better gas mileage), but with both gauges moving in different directions I became confused to the success/failure. That radar idea should be helpful. Thanks, guys!

Dave
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2005 Vulcan 750
Purchased May, 2011 @ 2,172
Splines lubed @ 2,962 (were in good shape)
Küryakyn Daily Tour Bag
SS-28 Slipstreamer Smoke
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