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For what it's worth - here's Google's AI snippet asking about belt CVT efficiency: Belt-driven CVTs are 80% to 88% efficient in cars, and 70% to 75% efficient in scooters. They are less efficient than traditional manual transmissions (which hit 97%) because they rely on sliding friction to transfer power. However, their ability to keep the engine at its most...
It is always interesting to see what companies are willing to patent. Sometimes they reveal new, out-of-the-box thinking for an innovative approach to solving an old problem. A lot of times they are just to make sure no one else can make money off an idea without paying them royalties, particularly useful if there are tough aspects of the problem...

matmattmatthew Liked a reply to forum topic 2026 MTB Tech Rumors and Innovation - Longer and Slacker

7/6/2026 12:22pm
All this drivetrain efficiency/Gearbox discussion is making me think about the joy I get from riding my singlespeed.
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Speaking for myself - it's not that I don't want a GB - it's that I don't want a worse drive-system than I currently have. If GBs get to the point where the weight penalty is small and efficiency is comparable, I'll be riding them. I think many of the folks you think are Luddiltes are really just people how...

AgrAde Liked a reply to forum topic 2026 MTB Tech Rumors and Innovation - Longer and Slacker

7/6/2026 11:44am
Can we rename this thread and make a new rumors and tech one? This one is tainted now.
This forum topic has 6969 replies.
I'm mostly a sea-level XC rider these days, and mostly ride fast tires. My trailbike came with Minions, and I took it on a trip to Tahoe when it was new. Did a loop in the Tahoe-Donner area that was about 35 miles with 3500' of climbing with a lot of black. That was punishing. I swapped out the Minions...
Sorry, I didn't think through the gear ratio carefully, but even so, a pair of 10-25 cassettes in a box would be huge. It's hard to imagine a derailleur inside the box, so maybe 12 chains or belts, and a way to determine which drives the output shaft. I think conventional will win there.
Maybe this isn't an accurate point of view, but I feel like pedal MTBs and e-bikes aren't really trying to solve the same problems. I think a pretty massive effort goes into the design of pedal MTBs so that they can be comfortably and efficiently pedaled, at least outside of DH-specific bikes. Even enduro bikes, especially those that are raced...
The later. I haven't spent enough time looking at how Pinion and others layout the internals, but I suspect that the requirement to have the input and output shafts concentric creates some challenging design constraints. A GB that replaced the second chain on dual chain bikes might free up some of these. on the other hand, it would freeze up...
There are some pretty tough engineering challenges that need to be overcome before gearboxes can find their way into mainstream pedal MTBs. They pretty much have to be fully enclosed, as lubricated gears at BB height would never survive otherwise. That's a lot of material to form that enclosure. Perhaps some use of really tough fiber-filled thermo-plastics could offset some...
I think part of the problem is that "MTB" covers a really diverse range of riding styles, and for the different styles, a variety of engineering requirements and interests. It's easy for people (myself included) to only consider the style(s) of riding they do when they promote or bash posts. I agree that there might be interesting trickle-down technology from...
Oddly, I've never felt that the rear derailleur was holding me back in any way. You have an interesting theory though. I'll be closely watching the XC comps in the coming years, waiting for the gearbox to make its debut. I don't keep up with the UCI enduro scene. Is anyone there running a gearbox? I know Dalt Stone runs...

AgrAde Liked a reply to forum topic 2026 MTB Tech Rumors and Innovation - Longer and Slacker

7/2/2026 8:53am
As though the the gearbox wasn't also invented in the 1800s... Feel free to hate the lightest, simplest, most serviceable, most efficient method of changing gears on a bicycle that humanity has invented so far, but the rest of us will accept derailleurs where they make sense.
This forum topic has 6969 replies.
Know of any carbon XC bikes that use a gearbox? For the downhill and adventure crowd, gearboxes may be a reasonable solution, but the current offerings are not great for those of us that like to pedal a lot. Maybe they'll get there eventually, but at the moment they would add about 3.5 lbs to my 22 lb bike, while...

smelly Liked a reply to forum topic 2026 MTB Tech Rumors and Innovation - Longer and Slacker

7/1/2026 1:26pm
I typically use the climb switch once per ride. I like to turn it on halfway up the climb when I remember I have it and might as well use it. I tend to turn it off halfway down the descent when I’m puzzling over why my suspension isn’t working. I suspect I am not in the minority.
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No ageism in here! I'm 40, and the bike I ride most is my Singlespeed. So I, in fact, do stand while climbing, a lot.
This forum topic has 6969 replies.

Uncle Cliffy Liked a reply to forum topic 2026 MTB Tech Rumors and Innovation - Longer and Slacker

6/12/2026 12:27pm
Maybe my example was too anecdotal. There’s always been asshole riders in my area, regardless of the bike they’re on. New people getting into the sport that mailorder their bikes, and don’t learn the rules of the trail like the good old days. Anyone remember how the shops, magazines and IMBA used to preach “the rules of the trail” to new riders? Who’s doing it now? When I’m on my Ebike, I always try to say hello to the people I pass and make conversation. I’ve always been that way. After getting one, I’ve seen the staring and subjectively bad...
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downhillpunk32 Liked a reply to forum topic 2026 MTB Tech Rumors and Innovation - Longer and Slacker

6/11/2026 9:49am
That was originally part of it, yes. But now everyone who isn't physically fit or is simply lazy can have a similar experience without having to put in effort. Same reason why pickleball is growing so quickly and tennis courts are being replaced. Most people want the easier option
This forum topic has 6969 replies.