Shimano RT81 Ice-Tec rotor with BB7 caliper

Quick one as promised to give heads up if the marriage is actually possible. Anyway, both of the components are not compatible. Officially. What I’m describing below is (successful) attempt to save my ass, rather than 100% planned action. So if you want to follow me do it on your own risk, and be careful so you can send the rotors back and have a full refund.

The Shimano rotors are stiff and light (due to steel-alloy sandwich technology and thick alloy spider). In my opinion the price (£21) is reasonable for the quality.


In my case the alloy spider was the only problem. Shimano have completely different calliper system, where pads are fit from the top, and they’re combined with bigger plates and heatsinks (quite neat system, just wondering how effective).


as you see below Avid got completely different system:


They have small “handles” to make the pads installation easier. So basically after fitting the rotors I realised why they won’t fit. At first glance is visible that the only problem is right pad. The small “handle” is overlapping about 2mm the spider arms. Scratched my head, pull out hacksaw and I’ve cut it. I deliberately left about 4mm to leave something I can grip on with pliers in the future.


And voilà! Slightly forced but marriage is possible ;-). The spider is just missing the calliper about a 1mm or so, phew! Quite lucky escape, but judging from scratches on the rotor, in worst case an extra washer (added underneath the calliper) will do the job in case of too small clearance.


The only problem might be removing the right pad with fingers but you can easily remove them with pliers.

Basically, handlebar change (to road one) forced me to install mechanical brakes I’ve chosen Avid BB7. Then I didn’t want to buy Shimano centerlock to 6 bolts adaptors (SM-RTDA10) but also didn’t want to pay 40 quid for one Avid rotor. So I’m aware that I created the whole situation by myself ;-). Anyway strange exercise, but with happy ending.

Keep’em rolling.

5 Replies to “Shimano RT81 Ice-Tec rotor with BB7 caliper”

  1. Although there are many uses of Windows Registry, it
    can be difficult to figure out what and when you should sign in or out.
    Don’t let people be confused or lost using the wrong sign-in/signout word.

    Here’s a listing of words that can be interchangeably.
    If you’re searching for details about signing in and
    sign out on Windows You will have to use the right one(s) instead of both.
    This is a quick guide to aid you.

    “Use Windows Live contactless Sign in” – This is the standard term to sign in/sign off.
    If you prefer a contactless method of signing in, then use
    “QR Code”. Make use of “Total Control” if you prefer the ability to take changes or manage the user experience as well
    as overall system security. If you have the option to change your password and you want to change it, do
    avoid using “Submit”. If you have the option to alter your
    password or make use of a contactless sign-out or sign in, then make the necessary adjustments so that you can make use
    of the option to change your password.

    “One-time procedure” – You will be required to input your username and password every time you sign into Windows
    Live. Enter these details , and then select “Submit.” Your account
    is now closed and you cannot longer login to Windows Live.
    It is the “one-time” method. The most preferred method of changing your password is by using the “Submit” option.

    “Social Media locking” The message will be displayed as you go through the
    sign-in process. It will ask whether you would like to
    lock your account. You can choose to locking
    your social media accounts. You’ll be asked for an account password, and you’ll enter
    the same one you just used during sign-in. You cannot undo this change.

    This is only applicable to your login details.

    “QR code” It is a six-sided barcode that can be
    decoded by smartphones or tablets computer. This allows sign in users to verify their account information without any effort.
    It can also be used to reset passwords, if needed.
    “QR Code” lets you access your sign-up process from
    any location with an access to a tablet computer
    or smartphone. This is ideal for those who need
    access to their account at another location other than their laptop computer or desktop.

    These changes will make signing in simpler for your website visitors.
    Registration will be made simple with “QR Code”, the blocking of social
    media profiles and “preregister guest”. Each of these modifications are designed to positively impact the
    user experience on your website. These changes will improve your odds of turning customers into signup
    success stories.

    Reginster, sign in, reginster,

  2. Pretty nice post. I just stumbled upon your
    weblog and wanted to say that I have truly enjoyed
    surfing around your blog posts. In any case I will be subscribing
    to your rss feed and I hope you write again soon!

  3. My spouse and I stumbled over here different web page
    and thought I may as well check things out. I like what I see so now i am following you.
    Look forward to going over your web page yet again.

Leave a Reply

Your email address will not be published. Required fields are marked *