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hello my friends, well its tire time for my 83 shadow 750. so i have the shop manual, and even a same year and model parts bike. the manual lists a 140/90-15, which is the exact same as the parts bike, looked at the tire on my bike and it is a 140/90-16 was wondering if previous owner changed the wheel, or if a 16 will fit a 15 wheel, stupid question i know, what do yall think. thanks guys.

donnie
 

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Photos?
 

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Either someone changed the wheel from a different bike or the tire is stamped wrong LOL I would do a little research on it but I'm pretty sure it is supposed to be a 15 Since you have the parts bike I would go back to the 15 in wheel, There is no plus to a lower profile tire on a shadow and there are more tire choices to the 15 inch too. However i just did a search and the V45 Magna had a 16 inch put on due to the performance of the bike, Maybe it was switched from a Magna. One way to tell would be the spokes, the shadow had straght spokes and the Magna had more of a star look to them, You can see what I mean in these pics.
Shaow


Magna

However in 84 I think they went to straight spokes on the Magna also, so could be that also but the V45 Magna from the 80's IS a 16 inch rear wheel.
84 Magna


Dauntae
 

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I don't think you could even get a 16 in on there with the shaft clearance (but what do I know).

Edit: FYI this is what a stock wheel should look like.
 

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Honda likes to use many of the same parts, Not sure however but the Magna wheel MIGHT bolt right up, And with the 16 with same size tire it would be just a shorter side wall.

Dauntae
 

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A 16" tire will fit on a 15" rim, it just won't stay on, the reverse of a 15" tire on a 16" rim not so much.
 

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hello my friends, well its tire time for my 83 shadow 750. so i have the shop manual, and even a same year and model parts bike. the manual lists a 140/90-15, which is the exact same as the parts bike, looked at the tire on my bike and it is a 140/90-16 was wondering if previous owner changed the wheel, or if a 16 will fit a 15 wheel, stupid question i know, what do yall think. thanks guys.

donnie
Wheels were changed. Just decice which you want to run 15 or 16.

By the way 140/90-15 is smaller in diameter than a 140/90-16. Same width and same sidewall height, but 16 is Taller Wheel.

Wouldn't it be kinda like putting a bigger rear sprocket of a chain drive?
 

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Found with quick google, Kinda explains this one. 16" will have better hwy MPG and lower rpm at speed, but gives up a little acceleration..

"
  • The size of a vehicle's tires affects many aspects of its performance and operation; these changes are small, but they are important nonetheless. From speed and fuel efficiency to ride quality and transmission shifting, tires of varying sizes possess varying advantages and disadvantages.

Speed

  • Tire width has no effect on vehicle speed, but tire height does. Simple math dictates this fact; in order to cover the same amount of ground, a small tire must rotate more times than a larger tire. Because of this, the taller the tire, the faster it propels the vehicle, even as the vehicle's engine produces the same number of rotations per minute (RPM). However, larger tires reduce acceleration as they increase overall vehicle mass, thus increasing the vehicle's inertia (its tendency to stay at rest once it has stopped).

Efficiency

  • Because they cover more ground without the need to increase an engine's RPM, taller tires make for more MPG on the highway. When traveling in town, however, smaller tires provide better fuel efficiency as they offer better acceleration (much of the fuel consumed by an engine is due to acceleration; it requires a great exertion of energy to propel a car's mass, and a great exertion of energy requires fuel to power it).

Clearance

  • Taller tires raise a vehicle higher off the ground, preventing cars from bottoming out on sloping streets. The taller the vehicle, the greater the driver's vantage point; the driver of a vehicle with taller tiles sits in an elevated position with a better view of surrounding traffic, dangerous obstacles and road conditions.

Handling and Traction

  • Smaller tires create improved handling, as their sidewalls are less flexible and their small mass is more aerodynamic. Meanwhile, wider tires with a greater diameter make for a smoother ride as they are more flexible and absorb more impact. Because of this impact-absorbing quality, rough terrain and small bumps become less noticeable and the vehicle's ride comfort increases.

Gauges

  • Changing a vehicle's tire size affects its speedometer and odometer displays, as these gauges calculate speed and distance based on the vehicle's RPM coupled with its original tire size. When equipped with tires taller than its standard tires, a vehicle's speedometer displays a lower-than-actual speed and its odometer shows less distance than has actually been traveled. Changing tire size affects transmission shift points, as they are set up for a vehicle's original tire size. These disparities must be corrected with a different gear appropriate to the vehicle's current tire size,

Aesthetics

  • Drivers commonly change a vehicle's tire size simply to modify the vehicle's aesthetics. Some tires, especially larger tires, are considered decorative. Using large, low-profile tires or installing larger rear tires is viewed as stylish;

 
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