2 Unique frame/tire sizes, 2 very different styles of riding = more fun!
TLDR: +29er: TRACTION!!! Obstacle roll-over, braking, climbing, requires less suspension for comfort. Superior at low-PSI! Faster in general over most terrain/common situations (XC esp). Wheel+rim mass means less bent rims, more forgiving landings at equal 26 tire PSI.
-29er: Momentum MUST be kept in mind at all times. More up-shifting required! Slower acceleration, less snappy handling! Air/wheelie/tricks aren't as easy. High speed corner wheel flex.
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The "pro's and "cons" are technically measurable, but the FEELING (your perception bias) towards 29 vs 26 setup is the most important. Riding either platform depends on YOUR UNIQUE RIDING STYLE>.<
A common "fair" comparison is "long travel" 26er vs "short/medium" travel 29er. Both platforms require a radically different style to achieve "optimal" efficiency, aka FUN! You won't have much "fun" nor efficiency riding a heavier "big rig" 29er like a LT-26er. If you don't like up-shift-shifting a lot or don't have a "rapid-rise" system, be prepared for a thumb-shifting workouts! 29ers require more rapid-rise style up-shifting in-order to keep the momentum of the noticeably heavier/slower rotating wheels. You HAVE to increase/pre-plan your shifting... Here I'll try and make a list of situations where your approach will (ought) to be different. Here is my sorta "mock" experience from switching platforms:
PS- Others experiences may wildly differ... I digress.
Flat road/hardpack: 29er is slower to accelerate, but 5-10mph faster top end, and faster at over taking as momentum builds = skip-shifting down 1-3 gears as momentum builds.
Sudden/unexpected decelerations: 29ers keep energy momentum longer, but need longer to rebuild it, so to keep it going = rapid up-shifting is a must or you'll be slow-rolling until you get the wheels going. It takes much less energy to keep a heavier object continually rotating vs rebuilding said momentum from a slow start. You'll feel tired more trying to continually rebuild momentum vs keeping it going. 26ers excel in burst-acceleration situations. Easier to spin smaller wheels from low-momentum situations.
Uphill: 29ers have a significant traction advantage, but require more slow-speed balance skills. You will NOT be able to maneuver it as quickly/easily as 26er. But you WILL find traction in situations where the 26er is simply ineffective. Slow-speed balance is key, and must be relearned.
Downhill(s): 29ers are more stable at speed, more predicable over obstacles. Unless very technical (meaning high deceleration/acceleration variances) the 29er is faster over a linear path to the bottom, you'll need to account for the decrease braking time! Your route will need to be altered if say = CLIFF/ledge! Braking force required will be higher to stop heavier rotating mass, but you'll stop much sooner!
Technical, single-switch tracks: 29er will feel cumbersome bc of non-continuous momentum. 26er dominates in snappy, hard turn based terrain. Much less wheel-flex; 29er = roll over obstacles faster vs around them.
Air/parlor tricks: 26ers dominate in the air = less gyroscopic induced force bc of smaller wheels. 26er will go higher, with less effort. Your ability to correct in-air angles will be harder with 29er. BUT the 29er IS more stable in air, meaning it will stay a truer course... Right into danger if you just wing it w/o knowing where you want to land!
Pastures/Sand/Mud/Loose/Rocks/Roots/Ruts etc: 29er is dominant, period. Lower the PSI as low(er) and experience true child like- magic traction! Where the 26er is walking, you're still riding!
Winter/Snow: 29er is completely dominant. There has not been such a diff in riding capability for me as with the 29er! I can ride places not possible with the 26er. Ex, an 8" snow covered cow pasture/horse trail. Very low PSI, slow steady traction + staying on course is the key. These areas would stall out on LT-26 bc the suspension has little to do with keeping the traction, which is tire size dependent more so. Esp at low PSI, the 26er would pinch flat/sidewall-roll over vs 29er is still usable.
Overall: 29ers traction/roll-over/lower pressure/top-end speed makes for a unique experience. It's slower acceleration, slower tight handling, less air-maneuverability hinder "snappiness." As I've said in other threads: 26er = 4x4 Hummer vs 29er Tank bike, blasting through obstacles and rarely needing to avoid them. I like "tank-style" better! I was all but bored of 26er style, esp knowing a new "change" would require a vastly expensive, long-travel (LT has many downsides as well) kit, which still wouldn't address non-suspension based terrain challenges. The associated upkeep/fragility of LT-FS setups was also a concern. 1 harsh wreck on a FS could really cost a lot in repairs vs HT frame strength, esp if you heavy-haul gear/rear-rack dependance.
***Of serious note; after re-riding all the old trails I used to 26er blast through; I have not required a wheel truing at all. My 26er, no matter what rim material/brand = constant truing required!*** I believe this is bc the 29er wheels flex more and allows the shock to be spread and dampened more effectively over a much larger surface area.
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