Mon-Sat 8am-5pm PT
Sign Up
Serving cyclists
since 2002
Shimano Ultegra RD-R8150 12-Speed Rear Derailleur
Shimano Ultegra RD-R8150 12-Speed Rear Derailleur
Shimano Ultegra RD-R8150 12-Speed Rear Derailleur
Click Here for Larger Image
Shimano Ultegra RD-R8150 12-Speed Rear Derailleur
Shimano Ultegra RD-R8150 12-Speed Rear Derailleur
Shimano Ultegra RD-R8150 12-Speed Rear Derailleur

Shimano Ultegra RD-R8150 12-Speed Rear Derailleur

Mfg PartNum:IRDR8150A
In Stock Now
Ships Free!
Earn $32.79 in VIP credit. Click to Learn More.
This color/size is not eligible for VIP points

Backorder: This item is currently not in stock but is available to purchase today as a backorder. The expected availability date shown above is our best estimate as to when it will be shipped to you, but this date is subject to change based on our receipt of this item from its vendor. Shipping in the continental US is free for all backorder items (for international orders, our customer service team will contact you when the item is available to ship). Your credit card will not be charged until your item ships (Paypal requires payment up front, but you can cancel for full refund). Anytime prior to shipment, your backorder can be cancelled by contacting our customer service team.

The Fastest Ultegra Shifting To Date

Shimano Ultegra RD-R8150 12-Speed Rear Derailleur is more versatile than ever thanks to a single cage length option compatible with 11-28, 11-30, and 11-34 cassettes. It also packs the fastest, most precise shifting out there into a more affordable option.

This rear derailleur is updated with Shadow technology. Shadow tech is made with a low-profile design and single tension construction, so the derailleur does not hit the chainstay in rough riding conditions. The result is smooth and silent performance.

The Ultegra RD-R8150 12-Speed Rear Derailleur is also customizable via the Shimano E-Tube Project App, which allows you to personalize your bike, update firmware, and maintain it by connecting it wirelessly to your bike.


  • 58% faster than RD-R9150
  • Compact design includes an integrated wireless unit, charger, switch
  • LED status indicator (Battery indicator, Pairing, Adjust mode etc.)
  • Wider range capacity
  • Max. low sprocket: 34T
  • Weight: 262g

B-Stock - This product has one or more B-Stock units available. These units can be purchased at a discount (see option select). B-Stock units were returned from other customers and may have missing or damaged packaging materials. These units are otherwise as new. The full manufacturer warranty applies. Click Here for more information.

The product weight specified is an approximate weight based on the manufacturer's specifications (if available) or our measurement of one or two examples. For most products, the weight will typically vary by 5% to 10%.

Mfg PartNum: IRDR8150A 

Weight: 262 g

Pulley Teeth: 11 

Low sprocket_Max.: 34T 

Low sprocket_Min.: 28T 

Top sprocket_Max.: 14T 

Top sprocket_Min.: 11T 

Ordered by Most Relevant First
5 stars
4 stars
3 stars
2 stars
1 stars
Reviewed 1/13/2023
by Bkfong
Cycling Enthusiast
Reno, NV
Value Rating
Overall Rating
RR-R8150 12-speed rear derailleur

Charging cable sold separately. This cable is needed for the rear derailleur. Given the price of the derailleur, it should be included.

Was this review useful to you? Yes/No
Thank you for your feedback.

We are committed to delivering outstanding value and service to our customers, every day.
Try us today to see why so many of our customers come back again and again.

*Orders received before 3:00PM Pacific time are shipped the same day (Mon-Fri). Orders over $50
are shipped free (USA only, excluding AK and HI). Some exceptions apply. See Shipping for details. 00


Want to save on all your Bike Tires Direct purchases? Sign up here for exclusive discount offers.

BikeTiresDirect on Facebook BikeTiresDirect on Instagram BikeTiresDirect on Strava
5741 NE 87th Ave (I-205 exit 23B) Portland, OR 97220 | 800-682-0570 | [email protected]