putting a bigger rear tire on an 86 VT1100C - Honda Shadow Forums : Shadow Motorcycle Forum
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post #1 of 16 (permalink) Old 05-20-2019, 01:36 AM Thread Starter
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putting a bigger rear tire on an 86 VT1100C

Hello,
Apparently, my 86 VT1100C has a 140/90-15 size rear tire. I think it looks a bit small for this bike. Could I put a larger one on without negatively effecting the handling? What size?

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post #2 of 16 (permalink) Old 05-20-2019, 09:27 AM
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See how much clearance you have between the swing arm and the tire now each side. Later VT1100C use 170/80 but a 180/70 helps lower your final gearing output. Here's a tool to help with tire size calculation's. Put it in your favorite's: https://www.tacomaworld.com/tirecalc...0r15-170-80r15


A note to everybody, click the "chalk test" block to help tire pressure testing. https://www.tundras.com/threads/tire...to-guide.2114/





06' 1100 Spirit (sold 6/23/13)
71' CL 100 "Lil' Sista"
99' Valkyrie "Adele"
05' 1600 Vulcan "Ludabelle"

Ride Bell by "Yoman"

To everything there are exceptions.

Last edited by h13man; 05-20-2019 at 09:35 AM.
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post #3 of 16 (permalink) Old 05-20-2019, 10:18 AM
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How much clearance do you have between the tire and swingarm?
'87+ came with a 170/80/15. Just not sure how different the swingarm is on them '85-86 compared to later ones.

The 170/80 is ~3/4 inch taller and is 1 1/4 inches wider. So a minimum of 3/4 inch clearance on each side of the tire with the stock size to even think of the 170/80.
A 160/80/15 is just a touch taller and ~3/4 inch wider, so would give you a little wider that stock, but not quite as much as a 170/80.

This is the site I use to compare tires, gives you a quick estimate the size comparison.

1994 VT1100C
Starfire 185/65/15 rear tire (Darkside)
Perilli MT66 Route 110/90/19 front tire
Progressive 430HD Rear Shocks
Mustang Seat
National Cycle Windscreen




Last edited by blupupher; 05-20-2019 at 10:28 AM.
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post #4 of 16 (permalink) Old 05-20-2019, 11:08 AM
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You're supposed to have a 170/80-15 on the rear.
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post #5 of 16 (permalink) Old 05-20-2019, 02:41 PM
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Quote:
Originally Posted by jpr1968 View Post
You're supposed to have a 170/80-15 on the rear.
Not on '85-'86.

1994 VT1100C
Starfire 185/65/15 rear tire (Darkside)
Perilli MT66 Route 110/90/19 front tire
Progressive 430HD Rear Shocks
Mustang Seat
National Cycle Windscreen



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post #6 of 16 (permalink) Old 05-20-2019, 06:16 PM
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Quote:
Originally Posted by blupupher View Post
Not on '85-'86.
Several websites showed 170/80-15 and only a couple showed the 140/90-15 size. If he has the same width rim as later 1100's the 170/80-15 should fit.
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post #7 of 16 (permalink) Old 05-21-2019, 10:18 AM
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Quote:
Originally Posted by jpr1968 View Post
Several websites showed 170/80-15 and only a couple showed the 140/90-15 size. If he has the same width rim as later 1100's the 170/80-15 should fit.

I checked three different Honda suppliers and the stock tire size was 140/90-15. I'd say this being the 1st. model big Vtwin for Honda they definitely over looked the rear tire "fat look" compared to their HD competition.




06' 1100 Spirit (sold 6/23/13)
71' CL 100 "Lil' Sista"
99' Valkyrie "Adele"
05' 1600 Vulcan "Ludabelle"

Ride Bell by "Yoman"

To everything there are exceptions.
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post #8 of 16 (permalink) Old 05-22-2019, 11:21 AM
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150/90/15 fits just fine on my 85 VT1100C. The 140/90/15 is the correct stock size. It is recommended to only go up one size to properly fit the rim width. Going any larger will affect the road 'contact patch'. Unless you only want it for looks instead of proper handling, stick to one size up rule.

Last edited by DanMitch; 05-22-2019 at 11:29 AM.
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post #9 of 16 (permalink) Old 05-23-2019, 09:46 AM
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A 150/90 only makes the dia./O.D. .710 larger thus making the final output even taller than stock. There's no such one size up rule. Messing with the front tire size will effect handling more than anything. The OP needs to physically lower arse down and check his clearance on both sides and go from there.




06' 1100 Spirit (sold 6/23/13)
71' CL 100 "Lil' Sista"
99' Valkyrie "Adele"
05' 1600 Vulcan "Ludabelle"

Ride Bell by "Yoman"

To everything there are exceptions.
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post #10 of 16 (permalink) Old 05-27-2019, 02:44 AM Thread Starter
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I checked for clearance. Width is the problem area not diameter. There is only about 3/8 of an inch to the side between the stock tire and shaft housing on the swing arm. So it appears that the 150/90-15 would be the largest size that I could fit. Unless I could find a 160/90-15(but a quick internet search did not show anything).

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