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Thread: 26 inch Tundra Tires versus 29 inch

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  1. #1
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    Default 26 inch Tundra Tires versus 29 inch

    Does anyone know anything about handling characteristics of CC Ex. using 26 inch tires versus 29. I like the looks of the 29 inch better than the 26 but wondered if they cause lower airspeeds or other glitches. Also, I would like the better ground clearance afforded by the 29.

  2. #2
    Senior Member Centmont's Avatar
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    Default Re: 26 inch Tundra Tires versus 29 inch

    I have flown both sizes. Currently have the 29's but will go back to the 26's when these are worn out. They are a little slower than the 26's and, quite frankly, even though I land in some rough places, they just aren't needed on this 900# airplane (IMO). I assume you also know that if you make many asphalt landing, your tires will wear out very quickly. R
    Ralph Rogers
    Owner: TheCubWorks
    www.TheCubWorks.com
    CCSS #142 N123MR
    I have always felt the supercub is one thing mankind got right the first time but that there were better materials and methods to build them. CubCrafters products are proof I was right.

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    Senior Member randylervold's Avatar
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    Default Re: 26 inch Tundra Tires versus 29 inch

    Ralph has more rough strip experience than I do and he makes an excellent point about the weight of the plane. I would personally go with 26"s as a good all around solution. If you take the time to manage tire pressure (lowering/raising as needed for the surface) you can make them work well in the rough stuff quite well.

    That said I know Ben Hodges and Scot Warren both love their 29s, and we have a customer north of us here in Washington who has 31s installed on his single-place Carbon Cub and loves them.
    Randy Lervold

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    Senior Member John Hodges's Avatar
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    Default Re: 26 inch Tundra Tires versus 29 inch

    No shortage of opinions on this one. Most of our customers who purchase Carbon Cubs with larger size tires opt for the 26s, for the same reasons Ralph mentioned. Quite honestly, a major reason we went with 29s on our demo was the "bad ass" look, which it definately has. That said, the 29s at 4 to 5 psi have served us well rolling over some stuff that we didn't see when dragging a landing spot. And they are particularly nice on extremely soft surfaces such as sand dunes and dry lakes. We've hopped our of our Carbon Cub and practically sunk up to our ankles, but the airplane sits on top having only slightly disturbed the surface.
    Our 29s have a lot of asphalt time, since they are on a demo plane hangared at a regional airport. And we have done a significant amout of transition training on asphalt, which involves landing after landing after landing on asphalt. We have over 250 hrs on them now, and they still look fine.

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    Default Re: 26 inch Tundra Tires versus 29 inch

    Would appreciate some opinions on tire pressures for 26inch Tundras with AOSS suspension on different surface conditions. I suspect mysoft tires are preventing the AOSS from contributing very much. I have tried pressures from 5psi to 12psi but it is hard to discern what happens down there. I would like more action from the AOSS as this would have less rebound than the tires. Also wondering about softening the AOSS, is that possible?

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    Default Re: 26 inch Tundra Tires versus 29 inch

    Quote Originally Posted by pwill435 View Post
    Would appreciate some opinions on tire pressures for 26inch Tundras with AOSS suspension on different surface conditions. I suspect mysoft tires are preventing the AOSS from contributing very much. I have tried pressures from 5psi to 12psi but it is hard to discern what happens down there. I would like more action from the AOSS as this would have less rebound than the tires. Also wondering about softening the AOSS, is that possible?
    I found if one has a dirty hangar floor (dust etc)the footprint of the tire is clearly shown on the floor.The difference between 5psi and 12 psi is quite remarkable.Try it.Regards,ronmac.

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    Default Re: 26 inch Tundra Tires versus 29 inch

    I have the 26 inch tires on my sport cub. I have the bungee landing gear and run 11.5 lbs in the tires. That seems for me to do well off airport and on pavement. I have about 100 pavement landings and they seem to be holding up well though with no wear indicators I really have no idea. A husky at KDLS got over 400 pavement landings on his and didn't count the off port landings on his 31 inch Alaskans before they wore out. I mention this only because they told me when I bought my 26's that I could expect more than the 31's because the sport cub weighs so much less. They said to run them till you see cords them change them and that's what the Husky did. I also don't keep track of non pavement landings but have quite a few, not as many as pavement but a fair number. I'm not sure if I'm running the best pressure for wear but I like the way the plane handles in all situations.
    Rich

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    Senior Member Pilawt's Avatar
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    Default Re: 26 inch Tundra Tires versus 29 inch

    Rich, how much of speed loss do you notice with the 26" tires vs. 8.50s?
    Jeff Jacobs
    Vancouver WA / KVUO
    C-172N-180


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    Administrator Pete D's Avatar
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    Default Re: 26 inch Tundra Tires versus 29 inch

    From the current rev (REV G 01-31-2011) of the CC11-100 AMM (Section 5.4.7, Page 2) (http://www.cubcrafters.com/pdfs/sc/cc11-100amm.pdf)

    "The main wheels are of aluminum construction and are designed to be used with tires and tubes. The approved tire sizes are 6.00 x 6, 8.00 x 6, 8.50 x 6, 26” LSA Tundra, and 29” LSA Tundra."
    On pavement the wear can be slowed down a lot by keeping them inflated toward the upper end of the pressure range. 90% of the wear is not in the center but 2 or 3 inches off of the centerline. The lower the pressure, the more of the tire in contact with the ground. Taxi, especially turns scrub the tire against the pavement.
    Pete Dougherty
    Customer Support Manager
    Cub Crafters Inc

  10. #10
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    Default Re: 26 inch Tundra Tires versus 29 inch

    Not much , 2 mph at most .Alaskan bushwheel hold me that it wouldn't slow it down much. I did not do any speed runs before and after mostly because I didn't care if they slowed me down. I think I can safely say you won't notice the speed diff.
    Rich

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