Hosted by Mike Levy and featuring a rotating cast of the Pinkbike editorial team and other guests, the Pinkbike Podcast is a weekly update on all the latest stories from around the world of mountain biking, as well as some frank discussion about tech, racing, and everything in between.
After our particularly cruel but also completely necessary April Fool's prank where
I didn't post the second episode of the Grim Donut saga, we thought it was a good time to dig into the Donut's slow-moving story. The pace of the internet is such that it seems like the first episode came out a few years ago, I know, but I swear that we have some valid excuses. This Pinkbike podcast tackles that, and we also get into how the Grim Donut rides. For real this time.
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THE PINKBIKE PODCAST // EPISODE 2 - WHAT'S UP WITH THE GRIM DONUT?
April 8th, 2020
Levy, Kaz, James & Brian figure out why the hell the Donut is taking so long, and Levy talks about how it rides. Hit us in the comments with your suggestions: What do you want to hear us talk about? Would you be into watching a video version, or are our dulcet voices enough for you?
In progress?.....oh, good. Happy Days.
Basically what your saying is you’re looking at Pinkbike sat on the shitter at work?
FIFY:
PINKBIKERS are such dorks
The majority of riders don't give a rats ass about most of the stuff that gets people worked up about around here- POE, suspension curves, 66.5 vs 66 HA........
I wish you had a podcast/video series with MTB and non-mtb people to talk about life... I'd love to listen to you and a famous comedian/musician/actor, or someone non-industry, have a conversation. Share experiences and break past their facades. Maybe extended interviews with the people you feel are awesome/impactful. I've listened to some of your interviews and I'm not saying you could be what Joe Rogan used to be...but you could be I think it would end up being a mix between Jocko Willink and Danzig with a touch of Monty Python. You'd have an impact on a lot of listeners out there with no one else in their personal lives to relate to. (Guilt trip you a little) I mean--not all of us can help their Dad build the cabin they were born in.
I try to be an ambassador to this sport....for joeys and groms...that brings your stoke level and love/passion for this thing we call life. I also feel like I just went full on fan boy...but how often does one get a reply from the Tip. Thanks
You should get pinkbike to pony up some more cash and manufacture a grim donut 2 to remove the safety issues. change the head angle to 60 degrees instead of 57. I like the chopper feel myself but 57 degrees for a head tube angle is just asking for it...
Is that really an argument to buy an electric drivetrain? I'll go with the reliability of a cable all day long.
There are real arguments for an electric drivetrain, but not for me. I just love the feeling of autonomy when riding bikes.
What I would suggest is to have the audio accompanied by a "photorama", pics and links to all the things that are discussed.
Good job guys and long live the Grim Donut!
Except they don't. Even in the PB reviews of Stamina bikes, the most surprising thing was how well it climbs. The philosophy of putting the weight more centered to avoid wheelies under power and having a long wheelbase that does not result in as large of pitch changes in response to bumps compared to a short wheelbase is all physics, not opinion.
The weight is there for sure, but the problem with weight is that unless you are optimizing the bike for xc racing and are already at minimum weight and good fitness, how much weight matters is to an individual. Some people find a 32 lb bike heavy, others light.
As for turning or floppiness, simply not true. Just like every long term mountain biker adapted to riding modern trail bikes after starting out on old 26" wheel, ~1150 mm wheelbase, 68 degree HA trail bikes, turning these bikes is just a matter of getting used to them.
It remains a niche product, and even with some influence on the marketplace, I doubt that there'll be a complete change in overall mtb geometry like there was in the road racing world with compact racing geometry. And, that change was probably aided by getting rid of half the sizes of the bikes produced, which helped out the company as much as the customer.
Just because you can eventually get used to the flop doesn't mean that it isn't there. And, I've never met a bike that's so short that it "wheelies under power" if I'm even remotely trying to keep a normal riding position. That sure isn't from a lack of old bikes to ride or power being put down, either.
Weight really isn't a huge deal - but there's no getting around the fact that a slack HA, long ass bike isn't going to be as sprightly a climber as a dedicated XC bike. It's a tradeoff, just like anything else, and the pole is designed to sit and spin on the way up, not be out of the saddle, and be capable for the way back down. It will take more effort to get around tight corners, it will take more body english to jump, manual, wheelie, etc.
"The Machine is calm and composed when faced with technical climbs, and as long as I was able to keep putting the power down there wasn't much that could stop its progress. Not surprisingly, it was on slower speed, really tight sections of trail where the Machine felt out of its element. In those instances, it took more effort to muscle it around"
From the PB machine review.
Basically, bike does absolutely fine on climbs, on super tight sections the wheelbase is an issue (obviously). Yes, it has some flop at low speed, but its still very easy to balance once you get used to it, you just have to find the balance lean angle. Personally I feel that its actually easier to turn at lower speed with a slack head angle, because the increased geometric trail keeps the front wheel from tucking. Again, people got used to flop of modern trail bikes with 66 degree head angles and 1200mm wheelbases, which is what enduro bikes used to be like.
And yes, shorter wheelbase bikes do wheelie on climbs - its physics. If you are climbing up something steep and rocky, and you pitch the bike up enough, you have to really lean forward on the bars to get the front wheel to stick, as your seat is pretty much right over the rear axle vertically. Add a low gear to that as well. Objectively, a longer wheelbase with a longer front center will take a steeper angle to get to this point. It doesn't mean that other bikes suck at climbing, but it does mean that all things being equal (i.e seated rider, e.t.c), bikes like Pole perform better on climbs. And yes, there are still steep rough climbs that are just as hard on the pole as any other bike.
I agree that it is a niche bike, but I tend to avoid those conversations because it all depends on what you want from the bike. I like discussing technical aspects. Overall if you look at a Pole Stamina, its an inch longer in the front and inch longer in the rear compared to "regular" enduro bikes. It feel different, but from a pure physics perspective, its not that much different.
>but if we're talking about physics the slacker HA really does make the bike flop when turning and it's not a desirable characteristic.
If you want to get technical, flop isn't really a negative thing. Ability to control flop or its implications on front wheel traction is what matters.
Flop is a result of front drop in height as you turn the wheel from straight to 90 degrees. If you had a 90 degree head angle, you have no CG drop in height. If you have a 0 degree head angle, you have maximum drop in height. The flop manifests itself in the front wheel wanting to turn into the turn.
The thing that opposes the front wheel turning is the geometric trail (and your control of the bars). The larger the trail, the more the weathervane effect of the front wheel is pronounced. So if you have flop at low speeds due to a slack HA, as you increase speed, you get a more stable front wheel.
The second aspect to that is wheelbase. If you have a long wheelbase, you a) need more steering angle to make the same radius turn, and b) less lean angle since the bike is yawing more, so the centripetal balancing force is lower. So when the front wheel wants to flop and turn in the direction of the turn, you actually don't get an unstable platform.
Generally though, climbing performance shouldn't be categorized by how little a bike wheelies in the seated position on smooth trail.
>Generally though, climbing performance shouldn't be categorized by how little a bike wheelies in the seated position on smooth trail
I mean there is nothing really else. Modern suspension can be locked out for efficiency or kept open for traction and beyond that, its all about fitness.
I'd point to how XC racers certainly have the option to "size up" to get reach on their bikes, but quite often used layback posts to keep grip over the rear wheel, as they don't have to worry about the front wheel flopping/wandering/picking it's own line up a climb. Also, to the general body positioning on a road bike in terms of STA, which is static (obviously), or an XC bike, which changes very little from the low travel.
I'd also point out, you're arguing with an idiot who states that "how a bike wheelies" is the be all, end all of how to categorize climbing performance and implying that fitness+a locked out bike with DH angles is going to win in climbing performance. I'm fairly certain the only true generalization he's made is that a slacker bike is going to be more stable at speed. For someone who "likes to discuss technical aspects", refusing to admit that there's *some* kind of tradeoff for any geometry change is straight up wild.
I'd also state that if you're "steering" a long wheelbase bike with the handlebars and representing your argument with "centripetal force" you've also already lost. Flop is also manifested in the front wheel wanting to fold under, not track the turn. Additionally, if you've ever ridden a long, slack, bike at speed, I'd hope you're not trying to steer with the bars and rely on "less lean angle". And finally, I'll reiterate - buy, rent, or demo something akin to a pole, nicolai, etc. to try out the drawbacks for yourself, and stop armchair engineering garbage.
And a 24t ring says just about how unfit anyone is, regardless of how steep the terrain is. Give me VAM/power&grade, or that 24t speaks for itself. Thinking you're a hardcore climber for nannying a 24t freeride bike up a fireroad is...self-evident.