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  1. #1
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    SB-95 with 2.35 Nobby Nic rear...issues?

    Anyone running a 2.35 Knobby Nic on an SB-95? Any clearance issues?

  2. #2
    Lucky...
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    Yep. Been running a 2.35 Knobby Nic in the rear with a 2.35 Hans Damf in the front for about 600 miles. No clearance issues. Great, great combo.

    FWIW, I have a buddy running the HD both front and rear with no issues. HD is bigger than the KK.
    Yeti SB-95a Black

  3. #3
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    Quote Originally Posted by Mr Bacon Jr View Post
    Yep. Been running a 2.35 Knobby Nic in the rear with a 2.35 Hans Damf in the front for about 600 miles. No clearance issues. Great, great combo.

    FWIW, I have a buddy running the HD both front and rear with no issues. HD is bigger than the KK.
    Thanks Jr., I was going to go with the 2.2 but read something on the Schwalbe site with regard to tire size vs rolling resistance. Evidently in dirt, ie not pavement, the larger tire had a lower rolling resistance. I think spin-up could suffer from increased dynamic weight but in CP and BCGB type trails the ability to run even lower pressures, hence larger footprint, would be a decent trade-off in the climbs. Glad to know they'll fit!

    BTW, how's the Big Top?

  4. #4
    Lucky...
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    The larger tire thing works road and off road- good discussion here:

    Tech FAQ: Seriously, wider tires have lower rolling resistance than their narrower brethren

    I am running 28/26 front/rear, which works well on most CTX trails. (I am 220 ready to ride)
    Yeti SB-95a Black

  5. #5
    Lucky...
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    Oh, and the Big Top rocks- very similar handling to the SB-95, just a bit more flickable in the twisty stuff. Very easy to switch back and forth between bikes.
    Yeti SB-95a Black

  6. #6
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    My LBS spoke with Yeti recently and they said that they didn't recommend a tire larger than 2.3 in the rear of a SB-95. Clearance with the SRAM derailleur on the Enduro kit was my issue but they also said that a larger tire would also rub the seat post on large hits. They said that they were planning to update their site to reflect that, but I wouldn't be surprised if it's never updated. I would save the 2.35 for the front put the 2.2 in the rear. I have Ardents currently (2.4 and 2.2) and love them. Also, I switched my front derailleur to shimano and that also gave me more clearance.
    That creep can roll, man.

  7. #7
    Lucky...
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    My direct experience with the 2.35 Nobby Nic is no rubbing of seat tube on big hits. It is a smaller 2.35, so that may be the reason.
    Yeti SB-95a Black

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    I have a xl sb 95 and just mounted a set off 2.35 nobby nics. I released the air out of shock to bottom suspension and tire makes contact with seat tube. What a F'ing bummer!
    Last edited by wfo922; 01-14-2013 at 03:19 PM.

  9. #9
    Lucky...
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    Have never experienced this with same rear tire and frame size. I'm a big guy, and I use every bit of travel available on the rear just about every ride. Bottomed out the shock on Satruday- actually checked to see if there was any run. No contact. Wonder what the variable is....
    Yeti SB-95a Black

  10. #10
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    Quote Originally Posted by wfo922 View Post
    ...tire makes contact with seat post...
    You sure about that?

  11. #11
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    Quote Originally Posted by Dogboy View Post
    You sure about that?
    I haven't had the NN (or any Schwalbe for that matter) on the bike yet, but I've had tire-rub on the seat tube from both the Panaracer Rampage 2.35 and Geax Sturdy 2.3 under hard bottom-out - think DH trail high-speed berms and some jump/drop landings kind-of hard.

    Never had that harsh bottom out on riding outside those boundaries, that I have noticed.

    Large SB95, Stan's Flow rim.

  12. #12
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    I was really just questioning the tire making contact with the seat post (not seat tube).

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    What shock psi are you running in order to get correct sag? Does the o-ring on shock slide off shaft when you bottom hard? Maybe you are running more shock pressure which does not allow shock to completely cycle as much as my set up. It's just a thought.

  14. #14
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    Quote Originally Posted by Dogboy View Post
    I was really just questioning the tire making contact with the seat post (not seat tube).
    For the rear tire to hit the seat post, I am pretty sure something in the frame would have to separate.

    There's no way for the tire to move that high otherwise.

  15. #15
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    Nice catch. I meant the seat tube.

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    Just mounted up a 2.25 NN on the rear to replace the 2.35 which did not work on my bike. I now have sufficient tire clearance.

  17. #17
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    Quick update- I did get tire to seat tube rub today on a big hit hauling ass to the finish line at a TMBRA race. Was probably cooking at about 25 or so, flying down the final single track. Knocked the ring off the shock. With all the mid on the course today, it was hard to miss the big clean spot on the back of the seat tube.

    Nobby Nic is pretty much brand new, so has its full diameter right now.

    My analysis- does not happen very often, it's not going to hurt the bike, and I'm not going to worry about it....
    Yeti SB-95a Black

  18. #18
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    Quote Originally Posted by Mr Bacon Jr View Post
    Quick update- I did get tire to seat tube rub today on a big hit hauling ass to the finish line at a TMBRA race. Was probably cooking at about 25 or so, flying down the final single track. Knocked the ring off the shock. With all the mid on the course today, it was hard to miss the big clean spot on the back of the seat tube.

    Nobby Nic is pretty much brand new, so has its full diameter right now.

    My analysis- does not happen very often, it's not going to hurt the bike, and I'm not going to worry about it....
    Hmmm, didn't want to read that!
    Could you tell if it was tire rub or possibly mud rub? Also, since you haven't experienced it before, was the shock setting the same?

  19. #19
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    Quote Originally Posted by Simplemind View Post
    Hmmm, didn't want to read that!
    Could you tell if it was tire rub or possibly mud rub? Also, since you haven't experienced it before, was the shock setting the same?
    Well let's put it this way- I was standing in the bike wash line and the guy behind me pointed it out; clean paint surrounded by mud. By the finish, most of the mud on the tires was gone, so it was definitely rubber to seat tube.

    I have been jacking with shock pressure. Was running it pretty firm, and have been slowly softening it up. Really mostly use it as a trail/AM bike for weekend rides, and race the Big Top, but the tires on the SB were way more conducive to conditions yesterday than the race tires on the BT. Left all the shock/fork pressures the same as I do for all day excursions on BCGB. Probably should have added 5 lbs to the shock.

    No harm to the bike- I just went out to the garage, and now that the bike is clean, there is no evidence of the rub, either visually or by feel. May have happened in the past; I keep the bikes clean, and the only way it was noticeable is due to the mud on the frame.
    Yeti SB-95a Black

  20. #20
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    Quote Originally Posted by Mr Bacon Jr View Post
    No harm to the bike- I just went out to the garage, and now that the bike is clean, there is no evidence of the rub, either visually or by feel. May have happened in the past; I keep the bikes clean, and the only way it was noticeable is due to the mud on the frame.
    Surprised it's not missing a bit-o-paint (anodizing), so it must be just a smidge at full compression, like a 1/16" away from perfection. Time to get the tire grinder out.
    Since my broken hand has kept me off the bike I haven't put my 2.35 NN on yet. Wonder if the 2.25 has a smaller radii.

    I figured the race conditions could be a bit sketchy, but at least it wasn't full on mud pit.

  21. #21
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    Quote Originally Posted by Simplemind View Post
    I figured the race conditions could be a bit sketchy, but at least it wasn't full on mud pit.
    Not nearly as bad as I feared early yesterday driving out. Cat 3 race was nastier, as the rain had just stopped. By the time we went at 10:45 or so, the only really ugly part was the first bit of single track- they launched us up the road to avoid most of the red clay. By the time we got to the top of Fat Chucks, trail conditions were pretty bueno.
    Yeti SB-95a Black

  22. #22
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    I put some clear friction tape on the back of my seat tube out of paranoia, and rubbed it good doing downhilling last Labor day weekend (Burke Mtn, VT). Tame DH, but DH none the less. High speed, high-G-force berms, some significant drops and jumps. 2.3" Geax Sturdy tire.

    I'm sticking to 2.2" tires, probably, for the back. IF I can. I want to try the new 2.35" Ikon though.

  23. #23
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    The 2.35 NN tire looks so right on the bike, but it just doesn't work without rubbing. The 2.25 NN works just fine, but makes me wonder what I'm giving for traction compared to the 2.35.

    I will add I'm super stoked on these tires. Great predictable traction

  24. #24
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    Quote Originally Posted by wfo922 View Post
    I will add I'm super stoked on these tires. Great predictable traction
    Put a Hans Damf on the front- combo is unbeatable, IMHO.
    Yeti SB-95a Black

  25. #25
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    Yeti issue with tire clearance? You shouldn't be surprised.

  26. #26
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    So, the 2.25 NN has an ETRTO spec width of 57 (mm) and the 2.35 is 60 (mm). Assuming a round profile, and yes that's a big assumption, the difference in diameter could be as much as 6 mm, (~1/4"). That's probably all you need to prevent rubbing. Does that seem right?

  27. #27
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    Sounds right. I physically bottomed shock(released air) with both sized tires? 2.35 rubbed. 2.25 cleared by a 1/4" if not a little less.

  28. #28
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    FWIW, I've been measuring width/height of tires as I've (ab)used them on my '95.

    The measurements are width (w) and height (h), in mm, the morning after mounting, but not ridden.

    Measurements are to the outermost tread (or casing, if the sidewall ended up phatter than the tread).

    The height measurement is from the inner rim wall next to a spoke nipple to the outermost tread.

    Add this to the rim ERD and the you have the total diameter of the mounted tire on the wheel.

    I have included the ISO/ERTRO values, pulled from manufacturer web sites.

    I have experienced minor seat-tube tire rub with both the Rampage and the Sturdy but no other tire.

    The tires in bold I have used rear-mount on the '95.

    29er (Stan's Flow rim at 30 psi, tubeless)

    Maxxis Ardent 2.4, 62w, 77h, 59/61-622
    Kenda Nevegal 2.2, 62w, 75h, 55-622
    Kenda Slant6 2.2, 60w, 72h 56-622
    Geax AKA 2.2, 59w, 75h, 56-622
    Geax Sturdy 2.3, 58w, 77h, 58-622
    Panaracer Rampage 2.35, 60w, 75h, 58-622
    WTB Bronson 2.2, 56w, 73h, 52-622

    I goofed and forgot to measure the original Ikon, I'll just have to get another some time this year to complete the set.

    It never rubbed though.

  29. #29
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    Quote Originally Posted by bear View Post
    FWIW, I've been measuring width/height of tires as I've (ab)used them on my '95.
    Did I miss seeing the HD and NN on your list ?

  30. #30
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    Quote Originally Posted by Simplemind View Post
    Did I miss seeing the HD and NN on your list ?
    You didn't miss them ... I haven't had them to try yet.

    I should have a HD soon though. I may try a NN in April or May, depending how long the CG lasts.

    Which depends more on how much the weather lets me ride it.

    Hard.

  31. #31
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    Im currently running a specialized captain 2.2 tire on the back tubeless and its been great.

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