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Thread: Jumbo Jim

  1. #701
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    Quote Originally Posted by pOrk View Post
    Would you feel confident racing the JJ on groomed?
    While this would be dependent on conditions, I would prolly prefer the Bud/Lou.
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  2. #702
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    Quote Originally Posted by BansheeRune View Post
    While this would be dependent on conditions, I would prolly prefer the Bud/Lou.
    Kind of what i was thinking. Getting agressive with a high HR and that urgency can lead to extreme grip ‘situations.’ Maybe be best to have the helgas just in case.

  3. #703
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    The VH's are a great tire although, not 4.8. The deep lugs are amazing especially with lower pressure.
    I agree with Mikesee on the "wrinkle count for conditions" analogy.
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  4. #704
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    Quote Originally Posted by BansheeRune View Post
    The VH's are a great tire although, not 4.8. The deep lugs are amazing especially with lower pressure.
    I agree with Mikesee on the "wrinkle count for conditions" analogy.
    I agree. The JJs are sitting in the rafters waiting for warmer months. The VHs have been nothing short of amazing at 2-3psi for me considering its a 4.0. I was just hoping maybe the groomed track would let me get away with the lighter jims, but seeing how this is my first fat race, and I'd like to go SPD vs flats, I don't want to be worried about grip while clipped in.

    Thought about maybe getting a Flowbeist on the front. with VH on back (frame wont fit a 4.6 without going 1x, currently I have a 2x). But at this point just VH F/R should be good especially on groomed.

  5. #705
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    Quote Originally Posted by pOrk View Post
    I agree. The JJs are sitting in the rafters waiting for warmer months. The VHs have been nothing short of amazing at 2-3psi for me considering its a 4.0. I was just hoping maybe the groomed track would let me get away with the lighter jims, but seeing how this is my first fat race, and I'd like to go SPD vs flats, I don't want to be worried about grip while clipped in.

    Thought about maybe getting a Flowbeist on the front. with VH on back (frame wont fit a 4.6 without going 1x, currently I have a 2x). But at this point just VH F/R should be good especially on groomed.
    Frankly, giving the JJ's a shot with a practice run is worthy. Best way to get an idea of their snow performance is in the real world. Playing with the pressure and all that jazz is kinda fun experimentation as well.

    On the flow, I've been looking at the Wratchild as well. They seem to look rather nice in terms of lug size and depth.

    Dammit, I would love to be able to pick each aspect of a tire from an ala carte list from casing, tread pattern, rubbuh compound etc. and make my tires fully custom. How kewl would that be?

    Since I took up observed trials, I lost all interest in SPD's since a balance check is near to impossible with em. I have a preference for platforms that have pins on the perimeter as well as under the ball of the foot. Then I don't have to wear bastardized wing tips to ride a bike!
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  6. #706
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    Looks like I'll get to do that actually. I will have some time to hit the track a few days before.

    In the snow, I'm almost always flats. But summer singletrack, except unknown BC or really techy rides, I'm exclusively clipless. And especially races, just a cadence and motion habit I guess as I used to be flats/5-10s only for everything.

  7. #707
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    Quote Originally Posted by pOrk View Post
    Looks like I'll get to do that actually. I will have some time to hit the track a few days before.

    In the snow, I'm almost always flats. But summer singletrack, except unknown BC or really techy rides, I'm exclusively clipless. And especially races, just a cadence and motion habit I guess as I used to be flats/5-10s only for everything.
    Good stuff! Let us know your findings with the JJ's vs. VH's.

    I can relate to the SPD thing being a good choice for many. SPD does have its advantages.
    I've become so accustomed to freely moving on my pedals that I feel restricted with em is the primary reason I stopped using em.
    My cadence is 125-175 routinely with either SPD or flats, lest I'm gettin trialsy in the tech. (My bikes are gonna soap my mouth)
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  8. #708
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    I run the VH in front and JJ 4.0 rear all summer. Sometimes the rear washes out on me when braking in a turn (bad technique) but never lose traction when climbing. Sometimes spin out a bit on a technical like a log/rock more so than a knobier tire.

    snow? hmmm... VH would rock but JJ? IDK
    Last edited by Kirkerik; 4 Weeks Ago at 10:18 PM.
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  9. #709
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    I tested my well worn 4.0 lightskin pacestars over the past week in 5" of slick powder and they did almost as well as the 4.0 wazia studded tires on my second bike and I could only run the air down to 4.5psi due to burping concerns. This powder was very slick and everyone has been struggling on it. I plan on having some 4.8 SS JJ pacestars mounted to some new mulefuts within the next week to get some more float and go to the super low pressures for the next snowfall.

  10. #710
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    Quote Originally Posted by rcracer2 View Post
    I tested my well worn 4.0 lightskin pacestars over the past week in 5" of slick powder and they did almost as well as the 4.0 wazia studded tires on my second bike and I could only run the air down to 4.5psi due to burping concerns. This powder was very slick and everyone has been struggling on it. I plan on having some 4.8 SS JJ pacestars mounted to some new mulefuts within the next week to get some more float and go to the super low pressures for the next snowfall.
    Thanks for the feedback. I will get a chance this weekend to try the jims on a groomed track. I'm going skiing next to some groomed runs and will likely stop there afterward to test.

  11. #711
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    Cracked rubber on JJ Addix

    I just bought a brand new jumbo Jim 4.8 snakeskin addix and it came out of the box with about 8 cracks in the rubber at the edge of the tread. They almost look like slices but they're going in different directions and some of them are star-shaped. They don't go all the way through the tire just the outer layer of rubber. Has anybody seen anything like this on any of the new addix compound tires?

  12. #712
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    I have the same issue

  13. #713
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    Quote Originally Posted by cgpro856 View Post
    I just bought a brand new jumbo Jim 4.8 snakeskin addix and it came out of the box with about 8 cracks in the rubber at the edge of the tread. They almost look like slices but they're going in different directions and some of them are star-shaped. They don't go all the way through the tire just the outer layer of rubber. Has anybody seen anything like this on any of the new addix compound tires?
    I just got a pair of the 26 x 4.0 JJ SnakeSkin/Addix. I just checked and I do not have anything like you describe.

  14. #714
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    Quote Originally Posted by tankhead10 View Post
    Any pics of the 4.0 liteskins on a 80 mm rim??? thanks
    https://ficdn.mtbr.com/images/attach/jpg.gif
    https://ficdn.mtbr.com/images/attach/jpg.gif
    https://ficdn.mtbr.com/images/attach/jpg.gif
    Attached Thumbnails Attached Thumbnails Jumbo Jim-img_3223.jpg  

    Jumbo Jim-img_3382.jpg  

    Jumbo Jim-img_3372.jpg  


  15. #715
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    Not the toughest tires in the world. Hopefully the patch job holds up.

    Jumbo Jim-img_20180330_232658816-copy.jpg

  16. #716
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    Quote Originally Posted by ianick View Post
    Not the toughest tires in the world. Hopefully the patch job holds up.

    Click image for larger version. 

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    Not disputing that they are more fragile than many tires but that sort of comes with the weight. And I had that exact same thing happen to a steel belted car tire once, so not necessarily a sign of weakness.
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  17. #717
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    Quote Originally Posted by sryanak View Post
    Not disputing that they are more fragile than many tires but that sort of comes with the weight. And I had that exact same thing happen to a steel belted car tire once, so not necessarily a sign of weakness.
    Agreed. Something that big would take out any tire. Hard to see from the angle. But you can make out the golf ball size bubble on the side of the tire. Ruined my brand new Goodyear. Damn Turnpike.

    But aside from strength (which is still solid) JJ lites are awesome tires.

    https://ficdn.mtbr.com/images/attach/jpg.gif
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  18. #718
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    Quote Originally Posted by sryanak View Post
    Not disputing that they are more fragile than many tires but that sort of comes with the weight. And I had that exact same thing happen to a steel belted car tire once, so not necessarily a sign of weakness.
    You had a wooden stick puncture a steel belted tire? Wow. Cars exert ~750-1,000 lbs on each tire vs ~75-100 for a bike, so under the right conditions...

  19. #719
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    Quote Originally Posted by BlueCheesehead View Post
    You had a wooden stick puncture a steel belted tire? Wow. Cars exert ~750-1,000 lbs on each tire vs ~75-100 for a bike, so under the right conditions...
    A friend of mine was a tire guy for a long time. He once showed me a steel belted tire with a pencil thru it. The pencil was broke but it punctured the tire. Right conditions...

  20. #720
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    Just installed 2 x 4.8s. Weighed in around 1350 grams each. Pretty happy with the larger size over the 26x4s I was running

    Sent from my SM-G955F using Tapatalk

  21. #721
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    Quote Originally Posted by cgpro856 View Post
    I just bought a brand new jumbo Jim 4.8 snakeskin addix and it came out of the box with about 8 cracks in the rubber at the edge of the tread. They almost look like slices but they're going in different directions and some of them are star-shaped. They don't go all the way through the tire just the outer layer of rubber. Has anybody seen anything like this on any of the new addix compound tires?
    Quote Originally Posted by sadness View Post
    I have the same issue
    Quote Originally Posted by Rockadile View Post
    I just got a pair of the 26 x 4.0 JJ SnakeSkin/Addix. I just checked and I do not have anything like you describe.
    The 2 x 4.8 addik snakeskin that I just pruchased have no cracks anywhere that I can see

    Sent from my SM-G955F using Tapatalk

  22. #722
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    Quote Originally Posted by klappers View Post
    Just installed 2 x 4.8s. Weighed in around 1350 grams each. Pretty happy with the larger size over the 26x4s I was running

    Sent from my SM-G955F using Tapatalk
    Backwards fender? Have you found that to work better?

  23. #723
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    Quote Originally Posted by BlueCheesehead View Post
    Backwards fender? Have you found that to work better?
    Yep heaps better. Doesn't rub on the frame.

    Sent from my SM-G955F using Tapatalk

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