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Sneak Peek: CrankPump Plays Hide the Inflator, Bottom Bracket Mounted Co2

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The best way to make getting a flat worse is not being prepared to fix it. There are a number of mini pumps ans inflators out there designed to make the process as easy as possible, but a new company thinks they have a better idea. Named CrankPump, the company’s name is a bit misleading since instead of hiding a pump inside your bike’s bottom bracket, the gadget allows you to stash a co2 inflator.

CrankPump seems like a sure fire way to have access to inflation when you need it… Updated

crankpump leavers off work bench great focus yellow_2996 crank pump

Included in the CrankPump assembly is the co2 inflator itself, a threaded co2 cartridge, and two specially designed tire levers that are designed to “unzip” your tires from the rim with a patent pending method. More details on the levers should be available when the CrankPump goes live with a Kickstarter on the 16th.

Designed to only work with Shimano Hollowtech II cranksets, CrankPump actually replaces the plastic preload bolt that is included with the cranks. Ideally, you would adjust the bottom bracket as normal, tighten down the crank arm pinch bolts, then remove the preload bolt and replace with the CrankPump. Though in our experience you would at least need to loosen the outside pinch bolt to remove the preload bolt. The CrankPump also looks like it will require a special tool for installation and removal, so we’ve reached out to the company for more details.

CrankPump will ensure that you have at least a single co2 cartridge, inflator, and tire levers when you get a flat, but we can’t help but note that due to the design the CrankPump’s mass will be added to the rotational weight of the crankset. If you’re into the convenience of always having it on hand, and don’t mind having to unthread it from the bottom bracket to use or the extra weight, CrankPump could be very useful the next time you get a flat.

package

Update:

Damon from CrankPump got back to us with a few more details. The packaging of the CrankPump will double as a removal tool for the Hollowtech II preload bolt. You will have to loosen the pinch bolts to remove the Shimano bolt, but the CrankPump is designed with a smaller flange so you will be able to install and remove the inflator without tools. The cap is designed to use your fingers to turn in either direction, but it was designed to be easier to turn counter clockwise so it won’t get stuck.

Due to the design constraints of the axle, the CrankPump is limited to 12g co2 cartridges which typically inflate a standard road tire to 90 psi.

 

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36 Comments
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Pancakes
Pancakes
10 years ago

Does it really add to rotational inertia in a significant way? It’s in the middle, not on the end.

wheel-addict
wheel-addict
10 years ago

“we can’t help but note that due to the design the CrankPump’s mass will be added to the rotational weight of the crankset.”

Umm, by putting it in the crank spindle, rather than near the pedals, the amount of additional rotational weights is negligible, and certainly could not be detected by a human.

Looks like a great idea. I like it.

Jake
Jake
10 years ago

Never had a problem keeping one in my seat bag.

Joe
Joe
10 years ago

@Jake but its not aero!

Guy
Guy
10 years ago

Pretty neat little idea there. On a side note, does everything in the world now have to be funded by a kickstarter campaign?

Nate
Nate
10 years ago

With the presumption that most people do not toque their crank bolts properly, I foresee a lot of lost crank arms. I’ve seen a decent number of people ruin their Shimano cranksets by having that preload cap loose or missing altogether. Now you take away someone’s ability to properly tighten it? Disaster.

dead
dead
10 years ago

Have you guys taken a shimano hollowtech fixing bolt off before? you need to loosen the pinch bolts before taking this pump off and should be reinstalled with a torque wrench. Better luck next time.

Topmounter
Topmounter
10 years ago

“…but we can’t help but note that due to the design the CrankPump’s mass will be added to the rotational weight of the crankset.”

LOL, seriously? Please, do some extensive power meter comparison testing w/ and w/o and let us know what you find.

@Guy – Kickstarter is the new preorder. Besides, this is PRE-Kickstarter. T minus 5 days and counting.

CrankPump
10 years ago

@Nate and @dead – thanks for the comments. CrankPump can be used to preload the crank axle. Shimano recommends the preload bolt is tightened to between 0.7 to 1 NM. Once the pinch bolts have been tightened, the axle tension is firmly clamped, and you can remove CrankPump (by hand) when you need to fix a flat tyre.
To ensure CrankPump can be removed without loosening the pinch bolts, its flange is a slightly smaller diameter than the original preload bolt, so CrankPump doesn’t get clamped in place.

Rico
Rico
10 years ago

Not bad idea to utilize that space. I still like using my jersey pockets to carry stuff. On any standard jersey i can carry – iphone, 2x power bars, tube or tub, co2 and chuck, car key, money, cotton rag, and at least one full bottle. I just put the loose stuff in a zip lock. Honestly though I flat like once every two years because I use stans in all wheels incl. tubs. And this is on sh*tty roads.

buriedundersnow
buriedundersnow
10 years ago

I like it! I’m a fan of projects like this versus another brand of carbon wheels…..If it works as intended, I’m in.

Greg
Greg
10 years ago

That’s where I put my weed.

Ventruck
Ventruck
10 years ago

Nice to know the potential issue with the pinch bolts was addressed. Kinda curious about those tire levers too.
LOL @ the question of the effects of the rotating mass, though.

Chip Batson
Chip Batson
10 years ago

D*mn Greg. Excellent idea!

Angelo
Angelo
10 years ago

Ummmm I just slip a Co2 cartridge in my jersey pocket. So I don’t really get this?

Dockboy
Dockboy
10 years ago

: how? I’ve been looking for a container to fit in my Rivals for years!

Mike
Mike
10 years ago

How exactly is this easier than the CO2 inflator I keep in my saddle bag or jersey pocket? #redundant

Robbie Mubbledutt
Robbie Mubbledutt
10 years ago

Just because you CAN get a project on kickstarter doesn’t necessarily mean you SHOULD.

Frippolini
Frippolini
10 years ago

@ Greg… that’s hilarious, LOL. 🙂

Otherwise… if the readers on this forum (the correct customer segment) finds the product questionable… hmmm… unless these guys manage to squeeze in additional features and benefits, I have a hard time believing this will take off.
Let me phrase it this way… I still have to use my pockets/bag for some other tools, food, phone, rain jacket, etc.; so why should I bother getting one of these???

Nice try guys, but please try again when you have figured out how to put more functionality into the product (and I don’t mean squeezing a banana into the BB).

Rob
Rob
10 years ago

This is a great idea. I dislike saddle bags for a number of reasons, just never liked them. I also ride a lot, sometimes somewhat spontaneously. I have been on the road only to later realize I forgot to toss the CO2 in my pocket. This completely removes that risk, so I’m all for it. I also prefer relatively less stuff in my pockets if I can avoid it.

Haggis
Haggis
10 years ago

I wonder how this would effect the warranty of your crankset?

Kevinfromva
Kevinfromva
10 years ago

sick of preloaded bearings? Put something in your crank spindle!

Henry
Henry
10 years ago

(deleted) No offence, but what’s the bloody point? Instead of reaching for your back pocket or saddlebag, now you want us to unscrew this from within the bottombracket???? Takes more time, costs more money. ON the other hand… no wait, there’s no plus side to this…

Jake
Jake
10 years ago

Rotational weight, aero, a lot of riders just put a frame pump and a spare tube in their seat post.

BrandontheGinger
BrandontheGinger
10 years ago

(deleted)

Paniagua
Paniagua
10 years ago

What about the bar ends? just think of all that wasted space, guees we’ll have to wait for ver. 2.0

il Bruce
il Bruce
10 years ago

Does no one else see the elephant in the room? What the hell type of frame is that?

Slow Joe Crow
Slow Joe Crow
10 years ago

This would be even more clever if they made a version for SRAM/Truvativ and FSA cranks that inserts on the drive side like the ballast weights some pro road race teams use. This also eliminates the need to futz with preload bolts. I’m still not sure about those tire “levers” especially with some of the bead/rim combos I have done battle with.

Alex
Alex
10 years ago

@ il Bruce – Good question. Looks like a Softride aluminum to me.

CrankPump
10 years ago

Thanks for all your comments. It’s great that the people here on BikeRumour have different and well-informed opinions.

@Frippolini, CrankPump doesn’t try to do everything, it’s just a convenient way to store a pump. If you’re going to carry a CO2 pump, it’s pretty cool to not have to remember it. It’s also nice not to have it in your back pocket beating up your kidneys when you go over a bump.

@Henry, CrankPump doesn’t take much time or cost more. Unscrewing it takes about 10 seconds, and you’ll get to see that in the Kickstarter video. It’s priced about the same as most other CO2 pumps.

@Kevinfromva CrankPump is capable of preloading your bearings. It’s made of the same glass fibre reinforced Nylon66 material as your existing preload bolt.

@Haggis – we will talk with Shimano at Eurobike in two weeks about this

@il Bruce, thanks for appreciating the Softride Rocket we used as a bike model!

@Slow Joe Crow, I would love to make an SRAM and FSA version, and it is planned for the future.

Gabe
Gabe
10 years ago

And I can keep my spare tube in my steer tube 🙂

I like the idea for the minimalist look and would buy it if I weren’t a hippie who carries and actual pump.

alec
alec
10 years ago

I keep my jam sandwiches in my crank no room for a pump

Jupes
Jupes
10 years ago

I get it – but it just doesn’t warrant the extra expense or time to me in my opinion. I’ll continue to carry the CO2 cartridge in the saddle bag.

Tim
Tim
10 years ago

I think it is a great idea. Otherwise unused space. My only concern would be rattling, metal canister in a metal tube, gotta be loose or it won’t go in,(that’s not what she said). A foam sleeve or an end cap that centers it perhaps. Maybe we can use it to turn our cranks into a paintball gun, oh wait, I think I have gone too far, have a great night.

CrankPump
10 years ago

@Tim, glad to hear you like it. CrankPump includes a small cylinder of closed-cell foam that you pop into the axle the first time you install CrankPump, and stays at the end of the axle, preventing the cylinder rattling.

CrankPump
10 years ago

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