Vulcan 900 Classic Taller Rear Tire??? - Kawasaki Vulcan Forum : Vulcan Forums
 
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post #1 of 10 (permalink) Old 05-20-2017, 11:47 PM Thread Starter
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Vulcan 900 Classic Taller Rear Tire???

I have a 2009 Vulcan 900 Classic and just had a new rear tire installed. Decided to go a little taller and wider than stock, so I went with a 200/70-15. The front is the stock 130/90-16 which I believe now makes the rear tire about an inch taller. It seems kind of weird... Is this an acceptable setup? Bike rides fine, but the taller rear tire just seems strange. Anyone else running these sizes?

I'm not the type to leave my GI Joe's in the box.
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post #2 of 10 (permalink) Old 05-21-2017, 02:49 AM
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Check this site out. It'll help you understand your tire versus stock better. https://www.tacomaworld.com/tirecalc...0r15-200-70r15

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post #3 of 10 (permalink) Old 05-21-2017, 11:12 PM Thread Starter
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Thanks crazyriderguy, That's pretty awesome!

But that just proved my point that my rear tire is now about an inch taller than my front. Is that ok?

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post #4 of 10 (permalink) Old 05-21-2017, 11:35 PM
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Quote:
Originally Posted by Valentin_84 View Post
Thanks crazyriderguy, That's pretty awesome!

But that just proved my point that my rear tire is now about an inch taller than my front. Is that ok?
Since the 170/80 corrects the speedo, I would imagine your taller tire will have you traveling faster than indicated. So, you'll want to travel slower. Find someone and follow them in a car. Ride at various speeds to figure out the differences. You might also consider a 1 inch lowering kit to level out the bike. Other than that, I don't see why it wouldn't be ok.

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post #5 of 10 (permalink) Old 05-21-2017, 11:44 PM Thread Starter
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Quote:
Originally Posted by crazyriderguy View Post
Since the 170/80 corrects the speedo, I would imagine your taller tire will have you traveling faster than indicated. So, you'll want to travel slower. Find someone and follow them in a car. Ride at various speeds to figure out the differences. You might also consider a 1 inch lowering kit to level out the bike. Other than that, I don't see why it wouldn't be ok.
I'm glad you suggested that! I was actually just looking at the 1"-2" lowering kits to bring it back to where it was, or maybe to drop it just a tad lower in the rear than stock.

As long as the rear tire being taller than the front isn't a safety issue. That was my main concern.

I'm not the type to leave my GI Joe's in the box.

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post #6 of 10 (permalink) Old 05-22-2017, 08:40 AM
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You see bigger front tires than rear tires all the time, so why not taller rear? I wouldn't sweat it.

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post #7 of 10 (permalink) Old 05-22-2017, 10:33 AM Thread Starter
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Yeah, I guess it's not so strange after all. Just seemed weird at first because you generally see much taller front tires than rear.

Anyway, thanks guys!

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post #8 of 10 (permalink) Old 12-06-2017, 01:52 PM
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Quote:
Originally Posted by crazyriderguy View Post
Since the 170/80 corrects the speedo, I would imagine your taller tire will have you traveling faster than indicated. So, you'll want to travel slower. Find someone and follow them in a car. Ride at various speeds to figure out the differences. You might also consider a 1 inch lowering kit to level out the bike. Other than that, I don't see why it wouldn't be ok.
Can I jump in here for a sec...Why would a taller rear tire change the speedo? It's connected to the front wheel. Whatever the front wheel is turning is the speed you are going. The speedo is not connected to the tranny like a car or the rear wheel. The only things that change are the engine RPM's (lower) and the rear wheel revs per mile (lower). I changed my front wheel on a different bike to a smaller size and had to also change speedo drive to compensate for the smaller wheel to correct speed readings. That's it, larger rear wheel and smaller front wheel. Turned quicker, so be careful, and I guess since this post is old, you found that out already...
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post #9 of 10 (permalink) Old 12-06-2017, 02:25 PM
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The speedo isn't connected to the front wheel on our bikes, it reads a sensor on the crankshaft. This is why things like speedo-healers work: it's electronic, not mechanical. Since the crankshaft is connected to the rear wheel via the final drive, that's how a different-size rear wheel affects the speedo.
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post #10 of 10 (permalink) Old 12-06-2017, 07:34 PM
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Quote:
Originally Posted by coinneach View Post
The speedo isn't connected to the front wheel on our bikes, it reads a sensor on the crankshaft. This is why things like speedo-healers work: it's electronic, not mechanical. Since the crankshaft is connected to the rear wheel via the final drive, that's how a different-size rear wheel affects the speedo.
Oh, my bad..Having never owned a vulcan before a couple of days ago, I ASS U MED that it had a front speedo drive. The bike is still sitting in the old owners garage because I don't have any room for it until I sell the one in my garage. I haven't been able to do a close inspection. I need to look much more closely at my soon to be new to me bike. Lots to learn..
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