Crankbrothers Gem Portable Bicycle Hand Pump for Easy Tire Inflation

David c.: Great pump from crank brothers. Better than most of the cheap junk you find on here.

United States on Nov 11, 2023

Danielle: I had been looking for a pump that fits into a jersey pocket for extra security on long rides vs having CO2 and this pump fits the bill.

Canada on Nov 11, 2023

B. Ek-B.: The pump is compact and has two settings for high and low volume. Perfect for a small backpack or hip pack and anything crankbrothers is of quality.

United States on Sep 29, 2023

Michael Carter: This little pump has some great features, especially the ability to change from high pressure to high volume for larger mtb tires.

The mistake I made was strapping it to my bicycle frame. While mounted to the top tube, this pump occasionally came into contact with my knees. I finally decided to move it to the down tube, but discovered that water and sand had worked its way into the piston after a couple of light creek crossings. My pump was ruined and had to be returned. Also, be careful not to let it come into contact with the frame, as vibrations can scratch the paint.

I would recommend this pump for people who plan to store it in a hydration or hip pack and away from the elements. I did keep the exchanged item, as mounting it on the frame wasn't a deal breaker.

United States on Aug 31, 2023

Alexis: Bomba de alta presión con un tamaño contenido y unas prestaciones muy altas. Diseño con la clase habitual que caracteriza a la marca. Muy buena para ciclismo de carretera donde las presiones de los neumáticos son elevadas.

Spain on Feb 23, 2023

Sasha: This pump works way better than you'd expect such a tiny thing to work. Very little effort to pump a tire up to 40 PSI. While there is no gauge, there is a distinct change in the pump sound when you hit ~40PSI, so you have some indication of when you'd need to swap to the high pressure mode. As I keep my tires around 40, I don't really need the high pressure mode, but it surely works.

Read the instructions. I found it a little confusing to switch from the default Schrader mode to the Presta mode, and ended up lodging a piece in backwards. Watched a video right after and fixed it. Don't be me :)

My main complaint is with the mounting bracket -- it's sturdy, but I simply wish the mount had the pump flush with the tube, rather than sticking out to one side. I have enough clearance on my Grizl to have the pump hanging off to the side, thankfully, but your bike may not be as friendly to that. I won't take off points for it, since it worked out for me, but do keep this in mind.

United States on Aug 17, 2022

Jonathan Jonathan : Perfect & fit, form, & function is all there! Some have commented on it being thicker than some but I love it’s overall short and stoutness (it’s really not thick either maybe 1” round) & to the people who say it doesn’t work on Presta valves, should figure out how it works before commenting (effects sales) but YES IT DOES you unscrew the lid cap & turn the rubber piece inside around & re thread cap back on & whallllla , universal lol! But yeah love it on my aggressor pro paired with my blue crankbros stamp 1’s!! MY ONE complaint is that the head swivels freely (but not much & don’t notice when riding) so my hack with be a 1/4” round black magnet to the body for the latch to stick too to keep it in place (has a metal bar around valve switch) but really hasn’t/doesn’t bother me much! Solid Pump!

United States on Feb 02, 2022

Brad Tolhurst: a great small compact pump that is easy to use and works! This is my 3rd pump of this make and really like the attachment that holds it near my water bottle and blows up my tire to full capacity when I have a flat. unfortunately so do the 2 other people that stole my first two...remember to bring it inside with you when you lock your bike up!

Canada on Sep 02, 2021

Juan J.: Perfecta para bicicletas que usen llantas entre 30-110 psi, más se volvería muy difícil bombear. Saca de cualquier apuro en caso de pinchar, ya me ha salvado un par de veces.

Mexico on Jul 01, 2021

Ahmed de Rossi: Excelente calidad por el precio, super portatil: ligera y compacta. Buena operación y gran desempeño, infla las llantas en un tiempo razonable por un esfuerzo proporcionalmente razonable, sin contar que puedes escoger entre dos presiones de inflado distintas, facilitando el trabajo a corde a la llanta que vayas a inflar. El acabado es muy bueno, se ve bonita y de calidad.
El unico punto "malo" es la montura, si tu cuadro es de geometria no convencional pues alomejor batallas en colocarla pero como es realmente compacta no hay problema en llevarla en el jersey.

Mexico on May 11, 2021