Castle Creations B Link Bluetooth Adapter

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Castle Creations B Link Bluetooth Adapter
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The Castle Creations B Link Bluetooth Adapter gives you access to powerful Castle Link ESC tuning features right from your iOS or Android smartphone! Castle Link is an essential component of customization for all Castle ESCs. While the controllers are plug and play, the benefits of fine tuning your Castle ESC through the Castle Link Programming Suite have only reinforced the sophistication and value of the Castle product line. Not only do you get the ability to adjust many variables to enhance your experience, you have the assurance that firmware updates for future features and improvements for your controller are provided at no cost to you. 

Discover just how easily and quickly you can reign in tuning with the release of the Castle B•LINK BLUETOOTH ADAPTER, which will allow most Castle Link compatible products to be programmed via Bluetooth enabled mobile devices using the free application, with firmware updating to be added soon.

The Castle Link App contains all of the same tuning options as the Castle Link USB Programming Suite used on a Windows compatible PC, now with even greater flexibility. 


  • It is not possible to view data logs through the app at this time, but developers will continue to add features such as this.
  • All current Castle Creations ESCs, many older units and the BEC 2.0 and BEC Pro are supported, for a complete listing of compatible ESCs and accessories please view the PDF file in the resources tab above.
  • App available for free at the Apple App Store and Google Play. 


  • WIRELESS BLUETOOTH COMMUNICATION allows you to interface with most Castle Link compatible ESCs and accessories to change parameters and update  firmware.
  • COMPACT AND LIGHTWEIGHT at 1.20" x .81" x .25" (30.48mm x 20.55mm x 6.55mm) and 0.23oz (6.62g), it can be installed in the vehicle or airframe without significantly increasing model weight.
  • CONVENIENT WATERPROOF DESIGN allows you to quickly adjust settings in the field without disconnecting or disassembling the model. It can stay installed in the model or be easily swapped between models.
  • FREE APP DOWNLOAD is readily available in the Apple App Store or Google Play. Once downloaded it does not require a data connection so it can be used in the most remote of areas and won’t use data.
  • EASY TO USE application can be used with multiple B-Link Bluetooth Adapters or can store model information and allow you to use one adapter on multiple models.
  • PASSCODE PROTECTED with (user-selectable) 4-digit code to prevent unwanted tampering with your settings.
  • SYNC information between multiple devices by creating a free account (requires internet connection to sync database).
Input Voltage: Minimum: 4.5V - Maximum: 13V
Max Continuous Current: 10A
Maximum Burst Current: 20A
Dimensions (with wires): 7.25" x 0.81" x 0.27" (184.15mm x 20.55mm x 0.27"mm)
Dimensions (w/o wires): 1.20" x 0.81" x 0.27" (30.48mm x 20.55mm x 0.27"mm)
Weight: 6.62gm / 0.015lbs
Needed for Operation: Castle Link App found at Apple Store or Google Play. 

This product was added to our catalog on May 1, 2018

Verified Owner
Monday, May 28 2018 (about 4 years ago)
Castle Creations B Link Bluetooth Adapter
If you are serious about tuning, the B-Link has got to be the best thing you can do to your Castle ESC equipped machine. Castle link is nice and all, but some of my builds are difficult to access the receiver, so plugging in a castle link is a bit of a pain. Having the ability to install this in between the ESC and receiver, and then tune the ESC with my iphone makes this a must have accessory. I have never been able to tune my throttle, brake and drag brake profiles so effortlessly! I have 3 b-links, and as I get cars dialed in to perfection, I will gradually move the b-links to other cars until they are all perfect. The only complaint I have is that Castle didnt make this possible sooner!
Verified Owner
Monday, Aug 10 2020 (about a year ago)
Castle Creations B Link Bluetooth Adapter
I was super excited when I first got this and paired with my mambax8s, worked perfectly when I first set it up. A week later I was wanting to enable torque control so I got on my tablet went to the app and it went down hill from there. My tablet just did not want to sync with the B link anymore and when it did, it would connect for maybe 2 secs and then disconnect. I synced some other devices afterward just to be sure it wasn't on my end. Will be returning B link. Shame cause I had high Hope's for this $50 product...
Wednesday, Jul 1 2020 (about 2 years ago)
Castle Creations B Link Bluetooth Adapter
Using my 2-3 year old Android phone, I ran into issues with the app and the B Link Bluetooth Adapter from the very beginning. The only way I found to link the adapter to the Mamba X ESC was to repeatedly turn off/restart the phone until the app recognized the adapter. May work better with other brands of cell phones; but, certainly not mine. Will be buying the USB adapter instead. Buyer beware!
Verified Owner
Thursday, Nov 21 2019 (about 2 years ago)
Castle Creations B Link Bluetooth Adapter
I like it but I use android and got it to use with the app but doesn't work as it should maybe gotta update it. doesn't send info to the esc.
Verified Owner
Tuesday, Jan 18 2022 (5 months ago)
Castle Creations B Link Bluetooth Adapter
A little pain until I figured out how it works.
First - always turn on bluetooth and GPS (!!!) on your device (without active GPS B-link WILL NOT CONNECT TO ESC even if you set location permission for Castle link app on your phone - it won't work unless you turn on GPS).

Secondly, I had problems with the throttle and brake curves in the Castle application - I did a throttle calibration several times, but the curves did not work. Every time the motor was started with 100% throttle (i.e. no ramp up). As it turned out, the problem was in my Traxas TQi transmitter, where the smooth throttle parameter was also in the settings. In general, the transmitter settings interrupted the setting of the curves in the B-link settings of ESC. In the end, I set the TQi settings to default, and only then did the curves start working in the application.
Verified Owner
Thursday, Dec 23 2021 (6 months ago)
Castle Creations B Link Bluetooth Adapter
Easy to use. No issues at all. A must have if you want to program your ESC in my opinion
Verified Owner
Tuesday, Jan 19 2021 (about a year ago)
Castle Creations B Link Bluetooth Adapter
Highly recommend getting this if you just got a new castle creations esc. Very helpful getting things set to how you want it. Not something you’d want plugged in all the time for on-the-fly adjustments, but ideal for when you want to know how your esc is communicating to your motor and want to make more dramatic adjustments.
Verified Owner
Monday, Dec 21 2020 (about a year ago)
Castle Creations B Link Bluetooth Adapter
It is easy to install and makes changing your Esc settings really easy.
Verified Owner
Sunday, Apr 5 2020 (about 2 years ago)
Castle Creations B Link Bluetooth Adapter
Very convenient device. Re-entering into RC after almost a decade i was super excited to find this.
It makes tuning my cars so much more efficient for such a small weight/power penalty.
Verified Owner
Friday, Apr 15 2022 (3 months ago)
Castle Creations B Link Bluetooth Adapter
A wast of money does not work app does not send setting to b link uninstall app a few times .a wast of time .and money