PINKBIKE FIELD TEST
5 Enduro Bikes and 4 eMTBs Hucked To Flat
Bottom-Out Bonanza
You've watched all of the review videos, you've seen
Matt tackle the Impossible Climb, and you even
pressed play on the Efficiency Test for some reason. After all that, it's time to close down the summer Field Test the best way possible: the Huck to Flat. Our five enduro bikes and four eMTBs faced the same modest take-off as previous episodes, as well as the same pancake-flat landing.
We've seen some unexpected carnage in previous Huck to Flats and, unfortunately for Jason Lucas, it was no different this time around.
The Specialized Turbo Kenevo SL's non-drive-side Praxis crankarm said, ''
Hey, I've had enough of this Field Test shit,'' and decided to split. Thankfully,
@jasonlucas rolled away with only a very sore ankle and a request that we get someone else to huck the bikes next time.
After the failure, we boxed the crank up and shipped it back to Praxis for them to have a look. This is what they said:
| Our team received the damaged Carbon SL M30 170mm E-Crank back for inspection, but unfortunately due to the damage, it is too difficult to say exactly what the root cause was.
We cross-checked with our Global Warranty History on these Carbon SL M30 E-Cranks and of the thousands we've made/delivered to Specialized in the last 19 months, there have been very few warranties reported. This is also reconciled against our "Ultimate Load" strength test (highest load a crank can handle) we built which is above and beyond a typical load that would happen in a Huck. So yes, this leaves us scratching our heads a bit.
Our team here feels that most likely one of two things most likely happened: Either during prior ride testing of the Kenevo SL there was some type of rock-strike or blunt hit that created an internal fracture that didn't show itself until your test... or two, there was some type of unfortunate manufacturing flaw that showed itself at your test. - Praxis |
Previous Huck to Flat videos12 Bikes Hucked to Flat in Gratuitous Slow Motion13 Bikes Hucked to Flat at 1000 FPS8 Value Bikes Hucked to Flat in Super Slow Mo9 XC Bikes & the Grim Donut VS the Huck to Flat10 Trail and Enduro Bikes Hucked To Flat at 1,000 FPS10 Value Bikes Hucked to Flat In Slow Motion at 1,000 FPS
Pinkbike Huck to Flat presented by CushCore
The 2021 Summer Field Test was made possible with support from Dainese apparel and protection, and Sun Peaks Resort. Shout out also to Maxxis, Garmin, Freelap, and Toyota Pacific.
if you using three then you are extraordinary...
it depends on which carbon cranks you run. avoid Race Face and apparently Praxis.
Found it.
www.pinkbike.com/news/interview-aaron-gwin-and-john-hall-on-aarons-ankle-injury-broken-cranks-and-more.html
And yeah, because of stories like these, I'm not even considering carbon cranks at this point. I'm not a racer, so dropping a couple hundred grams low down on the bike isn't worth the potential downsides (let alone the cost).
No bodily injury > saving some grams.
That being said... The actual problem comes when it comes to evaluate if the cost of having a set of really well sorted out carbon cranks is worthy? My personal answer so far is no. Why bother spending double or even triple the money on something that's not 100% figured out by most of the companies just to save 100g on something you barely notice the weight difference? If you're like a tech nerd who's always in pursuit of the newest and hottest then by all means but I just simply don't think we're at the point where carbon cranks are good enough for most of the people, roadies maybe but definitely not for MTBers.
I suspect reliable and durable carbon cranks would need to be like carbon rims; just as heavy as alum. But there's not the durability upside you have with carbon rims. Riders who area easier on parts have a different calculation than some of us.
Just had a catastrophic failure with my XX1 cranks in Mammoth. I’m about 185lbs and hit a ~6-7 foot drop and the drive side arm tore right off of the aluminum core. They were great cranks until they weren’t lol
I found some new alum GX cranks to replace them and I won’t look back.
It really depends. All of our input is anecdotal.
quick goggle says Dave Blanchard
Co-Founder & CEO at Praxis
singletrackworld.com/forum/topic/xt-crank-fail
While they were in one of the bike shops in whistler, a third, non related rider came in with broken e14 cranks.
www.pinkbike.com/photo/21363840
Edit: Not sure how to do links in here but you get the idea
at 15:12 in the impossible climb video there is a really nice close up of that left crank arm without a SCRATCH on the leading edge where a serious rock strike could happen.
I didn't know alloy fatigue properties were weaker back in 1990? Amazing.
It's really time to expect more out of the industry, not make excuses.
"My ankles are ready..." or so you thought!
youtu.be/HffopSLCX1U
I'm not taking the carbon cranks off of my bike and I'm not worried, but I think this video is a good reminder that it doesn't hurt to take a few minutes to look for damage every now and then. Not that that's what happened here - we're not sure. If you're going to be thinking about your cranks all ride, every ride, you're probably best to take 'em off
In these huck to flats, they always completely blow threw the travel and at that point the force on the pedals is amplified. I'm surprised they havent had crank or spindle failures in the past.
Even on dirt jumper with 90mm of travel and simple motion control dumper i never used last 10 mm never ever, on the same kicker
In other words: Once these delivered cranks get put on bikes and ridden, they will have more to go by!
"When asked why the failure occurred, they replied - its a carbon crank!"
I've run plenty of carbon no worries, but when it comes to cranks, the thing along with pedals that cop the most abuse, I simply just don't get it.
….at Specialized HQ
“FUUUUUUUUUUUJUUUUJJJUUJJK”
Who cares, it is just fascinating to watch.
Moving forward, we'll probably include more of last year's favorite bike in the Field Tests
I don't really know what the humility of a bike manufacturer is like. All industries have some kind of benchmark that other companies take years to match. But most companies are probably loathe to admit that, even to themselves.
Seriously unimpressed and wouldnt be recommending this bike to anyone (these bikes are offroad bikes that are designed to cop a flogging, the pre existing damage excuse on the cranks is BS, cranks cop a hiding, they should be designed to cop ridiculous levels of damage and high impacts (eg using kevlar fibres etc) as a usual design environment.
I agree though. I love my sight. Range looks awesome.
Have a look here: www.transitionbikes.com/images/2020FrameFeaturesGallery_Bearings.jpg