StemCAPtain Stem Cap Products


StemCAPtains are an accessory for your bike that replaces your stem cap with a clock, thermometer, compass, or picture frame. Simply unscrew your existing current 1in or 1 1/8in threadless headset stem cap, pop in the CAPtain, and it’s Time to Ride!

NOTE: For Compass; steel frame, steerer tube, handlebar etc. may cause magnetic interference.


Average rating: based on 29 reviews.

thermometer: nice addition to my bike


Reviewed By: Louis Melini on 10/19/22

Like the other person reviewing the thermometer, this is my second one due to the first one popping out and lost. It had popped out a few times but I was able to find it. This thermometer and the previous one seems to read a up to 5 degrees high, not a problem as I am only interested in close approximations. Good to know what temperature I am at when I commute to my volunteer job for clothing selection.

Stem cap compass


Reviewed By: Janice S. on 5/5/22

As a sometimes directionally challenged touring cyclist, a compass is a great help. It was easy to install and I have a better idea of where I am when it is important to know.

It’s Cool


Reviewed By: Ed on 3/9/22

Neat little accessory. I 3D printed a stem holder to attach it to my recumbent trike. Works like a charm!

Love it but…..


Reviewed By: Larry on 12/18/21

I love this on my bike, fun to keep track of temperature as I ride. I love it so much I have bought it 3 times. Why you ask? Because twice it has popped out of holder and lost. Trying to find a way to make it more secure.

I like it a lot more then I thought I would!


Reviewed By: Kevin on 10/21/21

I have an older 80's trek steel frame and I was worried that it wouldn't work but installed the compass with a a few layers of electrical tape and small 1-2mm felt liner cut out stuffed in-between the compass base and my fork tube, no issues with magnetic interference (not sure the buffer is even needed since the compass sits above the fork tube in plastic cap, but per Cyclosource's disclaimer thought I would do it). Works great, very neat product!

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