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Thread: 27.5+ vs 29

  1. #1
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    27.5+ vs 29

    I have a Santa Cruz high tower that can take either 27.5+ or 29 wheels, I知 training for Leadville and ride both cross country and trail,
    I weigh 155 pounds, and I am a intermediate skill rider , i知 used to riding 27.5+
    im wondering if people think the mid fat or the 29 wheel would be faster all around for both serious climbing but also doing some technical riding. My budget is around 1k.

  2. #2
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    For racing it is a no brainer 29. They will weigh 200-500 grams less for the wheels and tires for the same strength. For a 100 mile grueling race, that is a lot of rotating weight to take off. At your price point, you can get an aluminum wheelset with super fancy hubs (I9, Dt Swiss 240s, King, Hadley (leaving Onxy out due to weight)) or carbon with good hubs (Hope or DT Swiss 350). I would suggest working with a good wheelbuilder like lacemine29, Pete's Wheels, or Southern Wheelworks to come up with a set that best balances your budget, weight, and durability needs.
    Riding slowly since 1977.

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    Why would the 29er wheelset weigh less? The tires?
    I just built a 27.5+ wheelset. The 40mm rims were 400grams each. I'm not sure a 29er rims would be much lighter. Hubs and spokes are probably a wash.

    I guess 29x2.25 tires would be lighter than 27.5x2.8 tires.

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    So many variables. Weight, rolling resistance, and grip are all terrain and configuration-dependent, not to mention your riding style. While I'd give the nod to 2.3-2.6ish 29 most of the time, you'll have to benchmark each one yourself for a real answer.

  5. #5
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    27.5 because it's closer to 26

  6. #6
    nvphatty
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    Quote Originally Posted by dundundata View Post
    27.5 because it's closer to 26
    yup, yup, and the weight diff is minimal at best, so don't buy into hysteria.

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    Quote Originally Posted by fastpath View Post
    Why would the 29er wheelset weigh less? The tires?
    I just built a 27.5+ wheelset. The 40mm rims were 400grams each. I'm not sure a 29er rims would be much lighter. Hubs and spokes are probably a wash.

    I guess 29x2.25 tires would be lighter than 27.5x2.8 tires.
    Lets compare apples to apples. all Exo casings:

    Maxxis Rekon 2.8 27.5+ = 780 grams (silk shield 885 grams)
    Maxxis Rekon 2.25 29= 670 grams
    Maxxis Ikon 2.8 27.5+= 770 grams
    Maxxis Ikon 2.2 29= 640 grams

    In tires alone you are talking about 240 grams and the 29er tires are stronger than their 27.5+ counterparts.

    Now comparing rims. Lets use Stans (which I am not a big fan of, but many racers love:

    Sentry 3 27.5 (32.0 mm internal width) = 521g
    Arch 3 29er (26.0 internal width) = 453g

    136 grams per the set increase in weight or 376 grams for the wheel tire combo. Is it a lot of weight? For casual riding, no. For racing a 100 mile race with 11,000 feet of climbing, all at elevations between 9,000 and 12,500 feet, it becomes a major difference. There is a reason that the racers are not running plus bikes. It is all about the least weight while staying reliable.
    Riding slowly since 1977.

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    Quote Originally Posted by fxjeffrey View Post
    I have a Santa Cruz high tower that can take either 27.5+ or 29 wheels, I知 training for Leadville and ride both cross country and trail,
    I weigh 155 pounds, and I am a intermediate skill rider , i知 used to riding 27.5+
    im wondering if people think the mid fat or the 29 wheel would be faster all around for both serious climbing but also doing some technical riding. My budget is around 1k.
    After posting twice in this thread, I realized you already asked about this. Did you not like the advice given before, which included responses from people who have raced the course several times?

    leadville wheel advice
    Riding slowly since 1977.

  9. #9
    nvphatty
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    Quote Originally Posted by Cary View Post
    Lets compare apples to apples. all Exo casings:

    Maxxis Rekon 2.8 27.5+ = 780 grams (silk shield 885 grams)
    Maxxis Rekon 2.25 29= 670 grams
    Maxxis Ikon 2.8 27.5+= 770 grams
    Maxxis Ikon 2.2 29= 640 grams

    In tires alone you are talking about 240 grams and the 29er tires are stronger than their 27.5+ counterparts.

    Now comparing rims. Lets use Stans (which I am not a big fan of, but many racers love:

    Sentry 3 27.5 (32.0 mm internal width) = 521g
    Arch 3 29er (26.0 internal width) = 453g

    136 grams per the set increase in weight or 376 grams for the wheel tire combo. Is it a lot of weight? For casual riding, no. For racing a 100 mile race with 11,000 feet of climbing, all at elevations between 9,000 and 12,500 feet, it becomes a major difference. There is a reason that the racers are not running plus bikes. It is all about the least weight while staying reliable.
    some racers DO run plus bikes, and no it's not a major diff.

  10. #10
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    Quote Originally Posted by Cary View Post
    Lets compare apples to apples. all Exo casings:

    Maxxis Rekon 2.8 27.5+ = 780 grams (silk shield 885 grams)
    Maxxis Rekon 2.25 29= 670 grams
    Maxxis Ikon 2.8 27.5+= 770 grams
    Maxxis Ikon 2.2 29= 640 grams

    In tires alone you are talking about 240 grams and the 29er tires are stronger than their 27.5+ counterparts.

    Now comparing rims. Lets use Stans (which I am not a big fan of, but many racers love:

    Sentry 3 27.5 (32.0 mm internal width) = 521g
    Arch 3 29er (26.0 internal width) = 453g

    136 grams per the set increase in weight or 376 grams for the wheel tire combo. Is it a lot of weight? For casual riding, no. For racing a 100 mile race with 11,000 feet of climbing, all at elevations between 9,000 and 12,500 feet, it becomes a major difference. There is a reason that the racers are not running plus bikes. It is all about the least weight while staying reliable.
    personally, id run an ikon 2.8 on an i30 rim, a carbon rim at that. when going carbon and comparing i30 rims, the weight difference is basically nill between 27.5 and 29 wheelset wieghts, all else being equal.

    your point on those specific tires cannot be argues against. i offer that not everyone wants/likes/needs/can use ikons nor do they need the same type of protection from rider to rider. each rider will know what they need in terms of protection and will pick what they need. in general, plus tires will be slightly heavier. it has been noted by riders that even the 29x2.35 ikon rolls faster on certain courses than a 29x2.2 and an ikon plus is on par with the 2.35 depending on the terrain.

  11. #11
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    Great analysis, thank you

  12. #12
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    I specifically wanted to compare 27.5 and 29.
    Mission accomplished

  13. #13
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    There is absolutely nothing technical about Leadville, nothing, if you find there is, you'd be better off taking a skills clinic or 3. I'd most definitely vote for a nice, light, carbon wheelset running some 29x2.2-2.35" tyres the likes of the Maxxis Crossmark2 or Aspen rear/Ikon or Ardent Race front in EXO casing for safety - having to stop and fix a flat is a royal PITA and I passed loads doing that on super light weight tyre setups.
    One day your life will flash before your eyes, will it be worth watching??

  14. #14
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    if thats the case, id have to agree with Lynx that 29er will be faster, no doubt. 27.5+ only starts to be viable when youre riding really rocky/rooty terrain consistently. only then does the extra traction from conforming to the surface start to even out the slightly larger diameter of a 29er tire.

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