Shimano cuts Hammerhead integrations after SRAM acquisition

A Hammerhead Karoo 2 computer on a table
(Image credit: SRAM / Hammerhead)

Shimano has requested that key Di2 integrations be removed from Hammerhead's cycling computers, meaning that users will no longer enjoy features such as being able to control the head unit displays using Shimano Di2 shifters.

The Hammerhead Karoo 2 is claimed by the manufacturer, which was recently acquired by SRAM, to be the most powerful cycling computer in the world. It's a computer that features in our guide to the best cycling computers and a five-star review from us here at Cyclingnews

We praised it for its functionality, but it appears that as of June 2nd, following a firmware upgrade, some functions will be removed. At Shimano's request, users will lose access to a subset of Di2 integration features. 

A screenshot of a notification screen

From a screenshot seen by Cyclingnews, it appears that the removal of features is down to a request from Shimano (Image credit: Courtesy)

What features are being removed?

Hammerhead Karoo users will, providing they do actually update the firmware on the date it is released, lose the ability to see their battery level, shifter mode, front and rear derailleur indications and also they will no longer be able to cycle through the data screens using the buttons hidden in the hoods.

If you can avoid the firmware update, users may be able to avoid the functionality loss, but this runs the risk of bugs and a loss of support for new features or maps.

Why have Shimano requested the removal?

At this stage it is unclear as to why the functionality is being removed for users. Cyclingnews has reached out to Shimano for comment.

Hammerhead was acquired by SRAM in January of this year, with SRAM's Vice President of Growth, Clint Weber, being quick to assure users of SRAM groupsets and Hammerhead computers that there would be no exclusivity between the technologies. 

"We do not plan on changing anything about how [Hammerhead] innovate," he said at the time. "We are excited about this acquisition and excited that their team will continue to design, manufacture, and sell technology and quality leading head units that work with every brand of drivetrain.”

It's clear this is likely to be an evolving story, and we'll be sure to follow it as it does. 

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Will Jones
Tech Writer

Will joined the Cyclingnews team as a reviews writer in 2022, having previously written for Cyclist, BikeRadar and Advntr. There are very few types of cycling he's not dabbled in, and he has a particular affection for older bikes and long lasting components. Road riding was his first love, before graduating to racing CX in Yorkshire. He's been touring on a vintage tandem all the way through to fixed gear gravel riding and MTB too. When he's not out riding one of his many bikes he can usually be found in the garage tinkering with another of them, or getting obsessive about tyres. Also, as he doesn't use Zwift, he's our go-to guy for bad weather testing... bless him.

Rides: Custom Zetland Audax, Bowman Palace:R, Peugeot Grand Tourisme Tandem, Falcon Explorer Tracklocross, Fairlight Secan & Strael