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Cycling Shifters

Shimano GRX ST-RX815 Left Di2 Shifter & Front Disc Brake Caliper

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Shimano GRX ST-RX815 Left Di2 Shifter & Front Disc Brake Caliper

The shift buttons are designed for easy reach from the hoods as well as in the drops, and offer a distinguishable click between upshifts and downshifts for a little extra peace of mind when you're 160-miles deep in a gravel race, and each deliberate move matters. Like its Ultegra road counterpart, the feel of shifting is much like clicking a mouse, requiring just 2-millimeters of movement on your end, so you don't have to put nearly as much focus into shifts, enabling you to pay more attention to the terrain ahead. On the back end of things, Shimano utilizes its BR-RX810 flat-mount calipers for reliable stopping power of ServoWave, and cooling properties of IceTech brake pads. The calipers operate with similar modulation to standard Ultegra, but ServoWave adds in improved feel right out of the gates, as the pads move together more quickly at first, before slowing for better control as you brake. This technology has been popular on the mountain bike side of things for some time, and now is trickling into gravel, where we get to enjoy the benefits of our off-road counterparts.

  • Shimano brings Di2 to the gravel scene for precise, electronic shifts

  • Redesigned hoods feature steep slope to keep your hands secure

  • Off-road tuned grip on hoods help you stay in place when its rough

  • Lever is shifted slightly for better access in the drops

  • ServoWave technology on the flat-mount calipers improves modulation

  • Big shift buttons with positive clicks let you focus on riding, not shifting

  • E-Tube technology allows you to fully customize your shifting

  • Built to be run as a 2x11 group with GRX Di2 derailleurs

Return Policy

Please email for returns, defects or order issues. Do not contact our chat support.

Final Sale

Items marked Final Sale are not returnable for any reason.  If there is a problem with your order please send an email to

Our Policy

To provide our customers with the flexibility and confidence to shop online, our return policy is 30 days. If opened, items must be defective or unused, and returned with original undamaged packaging to be eligible for a refund. All returns must be pre-approved via our return centre before being shipped back to our warehouse or returned in person to our 2205 West 1st location in Vancouver. Refunds can take up to 7 days to process and are reflected on your method of payment. Refunds will only be issued once the product is received, inspected, and approved by our receiving team. The amount will be refunded to the original form of payment and, in some circumstances, we may charge a restocking fee or refund to store credit. The date on which you placed your order is used to determine the return time frame.

Returns, not exchanges.

We do not offer exchanges. If you are looking for another size or colour, place a new order through our website, and then visit our return centre.

Shipping and Fulfilment

Order Fulfilment, Delivery, and Local Pick-up:

In-stock orders will be ready for pickup within 24-48hrs. Please wait for confirmation email prior to pickup.

In-stock orders will be shipped within 24-48 hours of placement.

For local pick-up, we will contact you when your item is ready. Please bring a copy of your order confirmation and identification when you pick up your order.

Shimano GRX ST-RX815 Left Di2 Shifter & Front Disc Brake Caliper - Shimano Guarantees

  • Free shipping on most orders over $150

  • Crash Replacement

    Receive 40% off a new kit, with our crash replacement guarantee.

  • Worldwide Shipping

    We ship worldwide!