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View Results: Have you ridden Pachaug Trail before?
Yes 146 25.04%
No 151 25.90%
I have not but I want to! 291 49.91%
I am scared to ride it.... 10 1.72%
Multiple Choice Poll. Voters: 583. You may not vote on this poll

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Old 04-10-2013, 09:30 AM   #8626
Rusty Rocket
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Old 04-10-2013, 06:01 PM   #8627
lester3
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malloy will try to ban that tshirt
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Old 04-10-2013, 07:23 PM   #8628
alcontrast
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I kind of wish sleeveless t-shirts were banned!


In regards to the 110 rear tire.. Last year I was looking for a more aggressive front tire for my F650gs which has an annoying 19" front wheel. I was also looking for a cheaper tire than the TKC80 I usually run up front.. I found a 19" Motorcross rear tire that was bi-directional and had the same dimensions as my TKC so I ordered it.. A Dunlop GeoMax. Probably not DOT approved..

Two things:
First. the layout and design of the knobs on a rear tire are a bit different than a front tire and while I was able to get used to the handling of that tire up front I would NOT do it again. It was real sketchy, especially when it was new, but I also put well over a thousand street miles on it which is not what it's designed for, even on the rear wheel!
Second. The tire was huge compared to my TKC with the same specs on the sidewall. I think they were both 110/80-19. I'm not sure why they were actually so much different.. My F650gs has a low fender that's mounted to a fork brace (standard forks, not USD's) and I had to add 3/4" spacers under the low fender to clear tire and I also had to remove the brake caliper and remount it after the wheel was installed since the tire was too wide to fit around it..
[if anyone wants a used 19" rear tire the knobs are worn but only in one direction and mostly just the center row. Free if you can pick it up]

I'll admit that tire sizes are sort of mysterious to me.. I'm sure there's a reason but I can't figure out why the second number (110/80-19) isn't simply width rather than ratio? And do the first two numbers mean the size of the "carcass" part of the tire rather than the outer edge of the knobs?
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Old 04-10-2013, 11:44 PM   #8629
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Quote:
Originally Posted by Rusty Rocket View Post
Crashing on ice must be less severe than diving in rocks at 40mph. Or maybe the surgeon thingy.
,,,
God dam july dry'd up and baked earth sucks too! I hope I can stay off my right shoulder when I hit in the future...its not if..its when... lol
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Old 04-11-2013, 12:05 AM   #8630
sparrow
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your up pretty early today. I'm hearing good things about the Hoot's ride in a couple weeks. It's supposed to be completely new this year.
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Old 04-11-2013, 05:59 AM   #8631
sledstorm1
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Quote:
Originally Posted by sparrow View Post
your up pretty early today. I'm hearing good things about the Hoot's ride in a couple weeks. It's supposed to be completely new this year.
night's! for a couple weeks... hoots would be a possible for me
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Old 04-11-2013, 07:40 AM   #8632
DariusFriedel
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I'm oncall that weekend so will be missing Hoot's and the CnR. :( Last year's Hoots was a bit too short so hopefully they extended it this year. Plus, last year was so much easier than the year before because it was dry. If it had been wet like 2011, the 50 miles would have been just right.
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Old 04-11-2013, 12:57 PM   #8633
swathman
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One man's tire is another man's tyre...

Quote:
Originally Posted by Bob Q View Post
Getting a new rear 606 for my DRZ, any feelings as to weather a 120 or 130 would be better?
Quote:
Originally Posted by ChrisRiedinger View Post
I would personally recommend a 110 if available. I find the 100/110 weighs a fair amount less...
Example: 120/90-18
  • The first number represents the width in millimeters (in this case 120). It's important to note that this is measured to the sidewall. Different knobby tread patterns of dirt bike tires can extend out past the sidewall.
  • The second number refers to height as a percentage of the width. So in the example the width is 108mm (90% of 120).
  • The third number (18 in this instance) is simply the inside diameter of the tire expressed as rim size.
Whether to go w/ a wide vs narrower tire is of course a matter of preference... In general (rubber compound and/or tread pattern notwithstanding) "wider" translates to:
  • Looks sexy...
  • Heavier (adds to rotational inertia)
  • Larger contact patch theoretically means more traction
  • Greater resistance to leaning/cornering
  • Slower handling (less nimble)
I like Chris' advice... Big tires can certainly smooth out the ride a bit but are usually preferred for sandy loose soil conditions.
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Old 04-11-2013, 01:03 PM   #8634
alcontrast
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So they do measure the width from the widest part of the sidewall, not from the widest point of the knobbies! That's good to know..
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Old 04-11-2013, 01:29 PM   #8635
ChrisRiedinger
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Quote:
Originally Posted by swathman View Post
[*]Larger contact patch theoretically means more traction
Actually, this is not the case. Well maybe, but only because the heavier tier has more mass. But in theory, if tire mass was similar across two given tire widths, the narrow(er) tire would have higher traction per square inch of contact patch. Think snow tires, skinny ones cut through the snow and the wider ones tend to 'float'

Physics does not always agree with intuition
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Old 04-11-2013, 01:35 PM   #8636
swathman
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Quote:
Originally Posted by alcontrast View Post
So they do measure the width from the widest part of the sidewall, not from the widest point of the knobbies! That's good to know..
That's probably why your rear tire mounted in front was so much wider even tho sizing numbers were similar... Dang side knobbies!!
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Old 04-11-2013, 02:04 PM   #8637
swathman
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Quote:
Originally Posted by ChrisRiedinger View Post
Actually, this is not the case. Well maybe, but only because the heavier tier has more mass. But in theory, if tire mass was similar across two given tire widths, the narrow(er) tire would have higher traction per square inch of contact patch. Think snow tires, skinny ones cut through the snow and the wider ones tend to 'float'

Physics does not always agree with intuition
You are correct Sir!! That's kinda why I thru the word "theoretically" in there... Poor choice I guess. I didn't mean scientific theory. I mean't commonly perceived notion.

I think the whole "contact patch" idea is kinda flawed anyways when talking dirt bike tires. Really, how much more of a 130/90-18 makes contact to a hard flat surface vs a 110/100-18? To me a wider tire only matters when it's completely engulfed in loose dirt and all that extra surface area might be of value...
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Old 04-11-2013, 02:37 PM   #8638
kenny61
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Quote:
Originally Posted by ChrisRiedinger View Post
Actually, this is not the case. Well maybe, but only because the heavier tier has more mass. But in theory, if tire mass was similar across two given tire widths, the narrow(er) tire would have higher traction per square inch of contact patch. Think snow tires, skinny ones cut through the snow and the wider ones tend to 'float'

Physics does not always agree with intuition

It depends of the surface as you said a skinnier tire cuts down into the snow alowing it to reach firm ground on a high traction surface such as asphalt wider is better which is why nascar doesnt run skinny bicycle tires. wider tires are also used for flotation such as deep botomless mud because teh skinny tire could never dig down to anything
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Old 04-11-2013, 02:42 PM   #8639
mrt10x
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yeah but what kind of oil do you use
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Old 04-11-2013, 02:43 PM   #8640
kenny61
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Quote:
Hardpack-you want short soft knobs and a wide tire.Sand/mud-the standard size with a more open spaced knob,that is taller with a stiffer sidewall. This goes for front and back.The idea is to have more tire in conact with hard terrain.Soft or sandy terrain-the narrow tire with wider spaced knobs is cutting in and cleaning better. IF you use a wide tire in sand-it will skate across.
http://www.thumpertalk.com/topic/859...at-front-tire/
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