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Author Topic: Widest tire possible and fit for riding for an 18 x 1.85 rear rim?  (Read 9109 times)

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Offline cocinero196

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Widest tire possible and fit for riding for an 18 x 1.85 rear rim?
« on: February 05, 2016, 05:12:26 AM »

Any thoughts on the widest tire possible and fit for riding for an 18 x 1.85 rear rim? ;D
Will a 4.5 x 18 or a 120 x 18 tire still be okay for the 1.85 rim width?
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Offline calj737

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Re: Widest tire possible and fit for riding for an 18 x 1.85 rear rim?
« Reply #1 on: February 05, 2016, 05:15:33 AM »
120 is pretty wide depending upon the aspect ratio. Best to stick with a 110 or 4.10.
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Offline cocinero196

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Re: Widest tire possible and fit for riding for an 18 x 1.85 rear rim?
« Reply #2 on: February 05, 2016, 07:04:42 AM »
Quote from: calj737 on February 05, 2016, 05:15:33 AM
120 is pretty wide depending upon the aspect ratio. Best to stick with a 110 or 4.10.

Thanks! I really wanted the look of the 120 though >:(
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Offline 70CB750

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Re: Widest tire possible and fit for riding for an 18 x 1.85 rear rim?
« Reply #3 on: February 05, 2016, 07:15:58 AM »
Quote from: cocinero196 on February 05, 2016, 07:04:42 AM
Quote from: calj737 on February 05, 2016, 05:15:33 AM
120 is pretty wide depending upon the aspect ratio. Best to stick with a 110 or 4.10.

Thanks! I really wanted the look of the 120 though >:(

The look helps very little in tight corners  ;)

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Offline wowbagger

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Re: Widest tire possible and fit for riding for an 18 x 1.85 rear rim?
« Reply #4 on: February 05, 2016, 07:18:33 AM »
This does not take bike geometry or handling into account but it tells you what tire sizes can be installed on what rims widths:

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Offline CBGhia

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Re: Widest tire possible and fit for riding for an 18 x 1.85 rear rim?
« Reply #5 on: February 05, 2016, 07:24:05 AM »
yeah, the 100 should be the right size for that skinny little guy.

Edit:   Sorry, I was wrong.  110 is what I run on my 550 and I guess it has the same size rim. I put a 120 on there once and the handling really suffered.
« Last Edit: February 05, 2016, 10:35:55 AM by CBGhia »
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Offline Powderman

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Re: Widest tire possible and fit for riding for an 18 x 1.85 rear rim?
« Reply #6 on: February 05, 2016, 08:57:36 AM »
Will it fit, yes. Will it detract from the handling characteristics, yes. fitting a tire that wide on a skinny rim will pinch the side walls giving the tire more crown that if it were mounted on a proper size rim. I would not recommend a tire that big on that rim if I planned on actually riding the bike.
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Offline Old Moe Toe

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Re: Widest tire possible and fit for riding for an 18 x 1.85 rear rim?
« Reply #7 on: February 05, 2016, 06:36:18 PM »
If you MUST have a fatter back tire you can lace up a K7 (17inch) rear rim to your hub and put on a 130mm wide tire. I did that on my K2 and am very happy with it. The overall outside diameter of the tire was within a millimeter or 2 of the original 100mm wide tire. Only thing I had to do was cut a small section out of the chain guard to stop the wider tire rubbing.
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Offline cocinero196

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Re: Widest tire possible and fit for riding for an 18 x 1.85 rear rim?
« Reply #8 on: February 05, 2016, 09:40:27 PM »

Thanks guys! Will just probably get a wider rim to accommodate the fatter tire ;D
I'd like to stick to size 18, will 2.15 be okay for a 120 tire?
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Offline turboed13b

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Re: Widest tire possible and fit for riding for an 18 x 1.85 rear rim?
« Reply #9 on: February 05, 2016, 10:38:18 PM »
I went from a 110 to a 120 unless you are pushing hard into the corners and dragging knee you won't notice a difference.
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Offline cocinero196

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Re: Widest tire possible and fit for riding for an 18 x 1.85 rear rim?
« Reply #10 on: February 06, 2016, 02:27:22 AM »
Quote from: turboed13b on February 05, 2016, 10:38:18 PM
I went from a 110 to a 120 unless you are pushing hard into the corners and dragging knee you won't notice a difference.

What was the size of your rim?
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Offline calj737

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Re: Widest tire possible and fit for riding for an 18 x 1.85 rear rim?
« Reply #11 on: February 06, 2016, 02:43:47 AM »
Quote from: cocinero196 on February 05, 2016, 09:40:27 PM
I'd like to stick to size 18, will 2.15 be okay for a 120 tire?
I'd bump to a 2.5". There's no clearance problems with that rim, and it will support the 120 tire perfectly.
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"Of all tyrannies, a tyranny sincerely exercised for the good of it's victim may be the most oppressive. It may be better to live under robber barons than under omnipotent moral busybodies. The robber baron's cruelty may sometimes sleep, his cupidity may at some point be satiated, but those who torment us for our own good will torment us without end for they do so with the approval of their own conscience." - C.S. Lewis

Offline cocinero196

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Re: Widest tire possible and fit for riding for an 18 x 1.85 rear rim?
« Reply #12 on: February 06, 2016, 06:19:42 AM »
Quote from: calj737 on February 06, 2016, 02:43:47 AM
Quote from: cocinero196 on February 05, 2016, 09:40:27 PM
I'd like to stick to size 18, will 2.15 be okay for a 120 tire?
I'd bump to a 2.5". There's no clearance problems with that rim, and it will support the 120 tire perfectly.

Got it! ;) but I would still have to get a 40 spoke rim for the oem hub to match right?
Thanks, cal! Will be bugging you soon if I pull the trigger on an M-unit ;D
« Last Edit: February 06, 2016, 06:28:40 AM by cocinero196 »
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Offline turboed13b

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Re: Widest tire possible and fit for riding for an 18 x 1.85 rear rim?
« Reply #13 on: February 06, 2016, 06:21:33 AM »
Quote from: cocinero196 on February 06, 2016, 02:27:22 AM
Quote from: turboed13b on February 05, 2016, 10:38:18 PM
I went from a 110 to a 120 unless you are pushing hard into the corners and dragging knee you won't notice a difference.

What was the size of your rim?

1.85 I am moving tona 2.15 here soon.
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