Praxis' Ten Speed SolutionLooking for a wider gearing range? There are all sorts of add-on solutions out there right now, but Praxis feels that these modifications can cause both less than ideal jumps in gearing and hurt shifting performance. The better answer, they say, is their new $129.99 USD ten speed cassette that sports an 11 - 40 tooth range with a 11-13-15-17-19-21-24-28-34-40 spread.
Praxis' mission to design and manufacture a cassette had a few rules: they wanted it to fit on a standard freehub body, be competitive in both weight and cost, and not require any modifications to the derailleur. That last point was especially important as they feel that forcing a derailleur to work with a 42 tooth cog is pushing it to its outer limits, and that add-on cages are not an ideal solution when you factor in the total cost of the system. That's not to say that they won't offer a wider spread in the future, though, just that, at least at this point in time, they firmly believe that an 11 - 40 tooth spread is the ideal range when talking about ten speed derailleurs and drivetrains. The cassette weighs 320 grams, which is slightly lighter than an 11 - 36 XT model, and will be available in early June.
KS and the Electric Dropper PostRemember that electric dropper post from KS that we showed you last year? Well, KS is still working on the design, but it's not yet close to production. There's still no wires to be found - it employs a wireless remote that activates a piezoelectric motor within the post - but KS have been tinkering around with a more powerful battery since we last saw them. That added power means more size, with the brick-shaped battery clamped low on the display bike's seat tube, but the company is surely working on an integrated solution that will tuck it into the post or frame to be out of sight.
The post itself employs the same internal design as used within their other droppers, but instead of a plunger activated by a cable, a piezoelectric motor opens and closes a small valve to accomplish the same thing. There's the obvious possible tie-in with batteries that power electronic drivetrains, which means that KS might have the option of eliminating a battery altogether. Battery life is uncertain at this point in time, though, given that KS has yet to decide what they'll be using to power the post, but sixty or more hours of ride time is what we've seen out of suspension forks that use a piezoelectric motor to control its lockout function, so there's is no reason why KS couldn't come up with something similar to that. But what happens when the battery dies? This prototype automatically reverts to full extension if its battery runs out of juice, thereby allowing you to pedal out of the bush without wrecking your knees.
It's clearly a ways out, but it's easy to see how KS' wireless post could be a real headliner if and when it gets the nod for production.
WTB Goes Big and BiggerThe push for 27.5+ is coming from frame manufacturers, and it looks like it's going to be a hot topic in 2016. But what the hell is 27.5+ all about? If you take an extra-wide 27.5'' rim and mount a wide tire to it, one that's in the neighborhood of 2.8" or greater, the result is what's being called 27.5+. The height of the wide rim and wide tire combination is nearly the same as that of a 29" wheel, but with a larger footprint. The claimed benefits are greater traction and flotation, but without the sluggishness that a fat bike has. Is it a good thing? We don't know yet, but the frame manufacturers going ahead with their plans means that companies like WTB are asked to produce tires and rims to fit.
WTB's first two tire options are the 2.8'' wide Trail Blazer (
shown to the left) and the 3.0'' wide Bridger. The former has been in development for quite some time, even before it was obvious that there would be 27.5+ specific bikes, and the idea behind it is to have a large volume tire that will still fit in many 29er frames without rubbing the chain or seat stays. WTB hasn't thrown rolling speed out the window with these massive tires, though, with the Trail Blazer sporting a prominent center line and the company's Dual DNA compound to that end, as well as their TCS casing to make tubeless conversions safer and headache-free. Also, it's not nearly as heavy as you might suspect, coming in a 980 grams.
The 3.0'' wide Bridger is a much more serious looking 27.5+ tire, and it's also one that isn't likely to fit on many (
or any?) standard 29er frames that never had this sort of rubber in mind. The open tread pattern and massive, rounded profile should add up to predictable traction, and WTB is actually recommending it for pretty much any type of terrain and conditions. There are two versions in the works, with the lighter coming in at 1,207 grams and using their TCS Light casing and Dual DNA rubber compound. The big-boy option sports a TCS Touch casing and Gravity DNA rubber, with the total adding up to 1,510 grams.
Big tires mean big rims, and the Scraper checks out with a massive 45mm internal width. The 32 hole rim uses WTB's TCS inner profile, as you'd expect, and has a welded joint. The 27.5" version weighs in at 697 grams, while the 29er model is 735 grams.
would like to see cassettes with wider spaced ratios less cogs and lighter.
Whats the point in paying £500+ (or however much it is) for an 11 speed drive train when you can get an the same wide range 11-40t cassette in 10 speed for a fifth of the price?
Undoubtedly they both shift the same and do the same job at the end of the day.
I'm here waiting to buy that Praxxis cassette. Why an 11-40t cassette is not common is baffling to me.
... oh wait I know, its because I know how to set up a front deraileur, how to shift, how to choose a gear combo and maintain my bike...
Oh and all the new 1x rings with the long, high, square teeth? Straight out of the 1970's man... like back when we didn't have shift ramps, release teeth and pick up pins or index shifting... man we knew how to feel the shift back then... Lol.
I've run both 8 speed & 7 speed. Their chain retention was shit.
Also, I think after they get the bugs worked out, I think a dropper post is the only place I will use wireless on my bike (I think).
Too little, too late I fear as so many bikes come XO1/X1 as standard now.
Plus they run higher pressures so it is also not an issue.
Lets not forget some of them have tyres with side walls and compounds that the public cant buy too.
Beginner - Everything is soft (Tyres, spring rates etc.)
Pro - Everything is firm (Tyres, spring rates etc.)
Yeah I went from 2.5 minions to 2.5 muddy marys. Oops. big mistake. Braking was great. Other than that felt like I was riding a fat bike. Riding rocky chutes was like trying to bat two ballons down a narrow coridoor.
On 2.35 magic mary's now. Super gravity casing. Couldn't be happier.
@gabriel-mission9 magic marys are way too slow , try wicked will :p
And yeah they are a little slow rolling, but most of the tracks i ride don't have many long straight bits.
Either you are riding a full rigid or you throw your bike a lot. Maybe you weigh 20st?
WC racers run much lower pressures than that, and much less burly rims. I know Enve's are carbon, but I heard somewhere Peaty ran the same set of rims for a full season. He runs pretty narrow tyres and he's not a small guy.
www.pinkbike.com/news/Aaron-Gwin-Bike-Check-Fort-William-trek.html
Gwin is well known for liking to run his bike stiffer than anyone else out there. In this vid he talks about how he upped his tyre pressures from 24/26psi to 26/28psi because the track at Fort Bill is so rocky and punishing and he was worried about flatting. If Gwin can run 28 psi in his rear tyre at Fort Bill, I don't see how anyone can need to run 40psi in either tyre for racing. Maybe for more jumpy flowy stuff, but not for racing DH.
Cya
But yeah, I agree about the electric dropper. Electric? Really? No.
Think about what will soon be all linked to the same batteries.
Xtr di2 shifter, ks post, shock lock out.
All will be running on one battery.
Lot less cables.
Soon it will be integrated to google glasses (or equivalent) that will read the trail ahead and automatically drop your post unlock you shock and start changing your gear for the down hill.
Just wait.. next thing you know 'enduro minus!'. It's like an enduro bike, but with 120mm of travel. Sheeeesh.
Gazzaloddis
check my old bike: ep1.pinkbike.org/p4pb395704/p4pb395704.jpg
I must say, in presence of excellent 26ers and developed 29ers (in terms of geo and componentry), this 650B "invention", "innovation" made me as excited as a dog crap sticking to my seat tube, BUT this 275+ looks really promising to me and is something I would really like to try as soon as my kids grow up a bit and I can make some frame for myself. I'll sure test one in the mean time.
If there are more than 26 "= stop MTB !