Tire Size - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 9 (permalink) Old 02-04-2010, 09:49 PM Thread Starter
Matt Bailey
 
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Tire Size

I just bought a 1987 750 Vulcan from my buddy and I love it. I need to buy a new rear tire for it and wanted to know how big of a tire I can put on the 15 inch rim. Right now it has a 150\90-15 on it. Thankyou for any input.
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post #2 of 9 (permalink) Old 02-04-2010, 10:26 PM
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First off, welcome to the Madness. As for tires... Check the Vulcan Verses...

Here is an exerpt for tires
Metzeler ME880 150/90HB15 Rear Tire #1041800 (70836) $74.95
Metzeler ME880 100/90H19 Front Tire #1040700
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post #3 of 9 (permalink) Old 02-05-2010, 05:55 AM
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the biggest that I know that you can put on the rear is 170/80-15

if you are looking to buy Metzeler ME 880 Marathon, then check out
Motorcycle Superstore they are on sale for $138.99 for the 170/80-15
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post #4 of 9 (permalink) Old 02-05-2010, 11:37 PM
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Welcome to the Vulcan madness skidmark. Check out the link below, and pay particular attention to the rear spline lube when you pull the rear tire for replacement. The commonly recommended lube is Honda Moly60, with a high molybdenum disulphide (moly) content.

On the other hand, a local independent rider and bike mechanic told me to save money and buy some grease for a constant velocity joint in a front wheel drive car. I have not run this past other forum members yet for their reaction to this suggestion, nor have I checked the specifications, (ie. moly content percentage), availability or cost at a local automotive store.

Also watch for the MF-AGM batteries and NGK Iridium spark plugs.

The speedometer on the vn750 is driven by a gear on the front wheel hub, and reads ~ 10% low with the stock 100/90-19 tire mounted.

Changing it out for a 110/90-19 will almost correct the speedo and odometer reading.
The general consensus seems to be that the larger diameter tire does not adversely affect handling, and many riders believe it improves it.

Because the odometer will read lower ( and more accurately) now for each mile traveled, you will get a lower calculated miles per gallon fuel economy. In actuality it has not changed at all.

Changing out the rear tire 150/90-15 for the slightly larger diameter 170/80-15, will however drop your engine speed by perhaps 4-5 hundred rpm while cruising at highway speed, and could improve fuel economy slightly.

Gordon

1991 VN 750 -"Cosmic Lady" or "Bad Girl"?
Purchased May 16, 2008
Approx.19,300km (12,000 miles)

H-D windshield
Relocated R/R
MF-AGM battery
Fiamm Freeway Blaster horns
F&S luggage rack and engine guard
Kury Offset Hiway pegs
July 13, 2016, Riding on the DARKSIDE now, Classic Radial 165/80-15


TOP TEN THINGS A NEW RIDER/OWNER SHOULD DO. Click on link.
https://www.vn750.com/forum/11-vn750-general-discussion/9127-top-ten-items-you-would-suggest-new-owner-do-his-new-ride.html

Last edited by OlHossCanada; 02-05-2010 at 11:39 PM.
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post #5 of 9 (permalink) Old 02-06-2010, 07:17 AM
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yes! when you pull that rear tire, lube those splines!
a tube of Honda Moly60 costs around $10. that might sound like a lot for a small tube of grease, but for 1, there is enough grease in one tube to do 3 spline lubes! also the cost to replace warn out splines, is about $1000!
so for me, it's worth it to spend the $10 on the Honda Moly60!
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post #6 of 9 (permalink) Old 02-06-2010, 10:59 AM
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I have tried several different brands, but always stuck with the stock sizes, and have had no issues. I don't like changing tire sizes on a motorcycle unless there is a reason beyond looks, and I would want proof, as in the long term experience with that size from several other riders, that it was safe. I actually prefer larger diameter/narrower rear tires than what the Vulcan has, and think the huge 240-300 series tires a lot of custom choppers have are absolutely ridiculous. It's a motorcycle, not a car.


The spline lube is critical. But IMO, if you do it on a regular basis (I do mine every 10,000 miles) choice of lubricant is not that big of a deal. I have used a variety of greases successfully. I used BelRay waterproof grease several times with no problems, and ir has no moly in it. Last time I splurged and got some Guard Dog moly grease. I don't see any reason why any grease designed for CV/U-joint/disc brake wheel bearings wouldn't work fine. My splines looked like new about 5,000 miles ago, when I last lubed them, at around 39,000 miles. But I bought the bike new, and did the splines the first time under 1000 miles. Jerry.

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
1994 Yamaha XT225 parts bike
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post #7 of 9 (permalink) Old 02-06-2010, 07:11 PM Thread Starter
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Thanks guys for all your help.
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post #8 of 9 (permalink) Old 02-09-2010, 08:09 PM
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Quote:
Originally Posted by skidmarkou812 View Post
I just bought a 1987 750 Vulcan from my buddy and I love it. I need to buy a new rear tire for it and wanted to know how big of a tire I can put on the 15 inch rim. Right now it has a 150\90-15 on it. Thankyou for any input.
FWIW, I oversized mine per the advice found here and couldn't be happier with the change. Was completely surprised by how much more stable the ride is now especially over bridges, patched cracks and grooved pavement. Bought the Metzler 880's in my signature, well worth it.

Would recommend buying both at the same time for more consistent handling and easier to track replacement age. If the tires are 5yrs or older, they need to be replaced regardless of treadwear. The rubber dries and becomes brittle which is just begging for trouble if you hit a pothole.

'89 Vulcan 750

VROC# 30232

HID Headlamp Conversion
V&H Cruzers (great sound)
Kaw V-Force Windshield
Kaw Rear Luggage Rack
Kaw Engine Guard
VN750.COM Grill Cover
W&M Black Magic Saddlebags
Diehard M/F Battery
R/R Replaced/Relocated
Stator Replaced
Voltmeter Installed
Splines Lubed
Metzler 880 Marathons
Front - 110/90-19
Rear - 170/80-15
Carbs Balanced
Carb Mix Adjusted
Fuel Tank Derusted/Lined/Sealed
NGK Iridium Plugs

Last edited by rsawyer; 02-09-2010 at 08:13 PM.
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post #9 of 9 (permalink) Old 02-09-2010, 10:18 PM
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FWIW, I recently installed Pirelli MT66 tires front and rear. The rear tire was stock sized, but you could upsize it I'm sure. These tires grip the road like a vise. I've never felt more stable and my turns are lower and faster. I can certainly recommend these.

Rubyrick

MY BABY...
'05 VN750
16,000 miles +
Kawi tank bib
Kawi rear rack
Small windshield
DEKA M/F battery
VN750.com Grill Cover
LED license plate frame
Clear Alternatives LED brake light
Cortech mini tank bag on rear rack
Pirelli MT66 Tires: 110 front / 150 rear
Splines lubed when tires installed at 10,650 miles
Splines lubed again at 14,400 with stubby valve stem install

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