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Park Tool CDG2 - Chainring Bolt Circle Diameter (BCD) Gauge

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Product Description


  • A handy workshop time saver that makes determining the BCD of a crank or ring a cinch.

  • Simple to use; just put the pegs into the mounting holes or chainring bolts of the crank or ring you want to measure and the indicator arm will highlight the correct 4 or 5 bolt standard.

  • Anodized and permanently laser etched for a long life.

  • Includes a centre to centre distance scale and reference chart for measuring other mounting pattern dimensions.

  • Made in the USA and covered by Park's legendary limited lifetime warranty

    Occasionally, without notice, manufacturers change product design and/or specifications.

  • Park Tool CDG2 - Chainring Bolt Circle Diameter (BCD) Gauge Reviews

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    Customer Reviews (1)


    Great tool for the workshop as it saves time and guess work..It's Blue and easily visible in the black flotsam in the workshop

    Great tool for the workshop as it saves time and guess work..It's Blue and easily visible in the black flotsam in the workshop

    Close review
    4.7 out of 5
    Build Quality: 4.5/5
    Performance: 4.5/5
    Value For Money: 5/5

    Workshop Tools Guide

    What are home and workshop tools?

    Home and workshop tools allow you to tinker around with your bike to your heart’s content. Whether that’s making a simple height adjustment or building a bike from scratch, kitting yourself out with your own mini workshop will give you hours of pleasure which will either annoy or delight your significant other(s).

    Who needs a home and workshop tools?

    Even novice cyclists will benefit from learning a few simple techniques. However, the more cycling you do, the more likely you are to want to learn how everything works and carry out minor repairs yourself.

    What are the choices?

    There are home and workshop tools available for all levels of rider, from a full tool kit to a simple torque wrench.

    What should I buy with it?

    Bike stands hold your steed in place to keep it steady and an apron and a pair of gloves will save your clothing from damage or smudges.

    Anything else?

    If in doubt, take your bike to your local bike shop for repairs. Better to have an expert fix it than to accidentally cause a fair few pounds worth of damage by having a go yourself.

    Delivery & Guarantee

    UK Delivery Information

    We are committed to offering fast and free delivery, whether you're ordering bikes, accessories or clothing. Our standard delivery service is FREE in the UK, regardless of the size and on all orders over £20.

    Please note that bulky products and bikes shipped to outlying UK regions are excluded from free shipping.

    Please note that Pre-Order dates can sometimes change due to updated stock information.

    Click here for more UK and international delivery information.

    Returns & Warranty

    It's easy to return a product with our 365 day, hassle free returns. 

    We will give you a full refund or exchange on any item that is returned to us unused/unfitted, in a resaleable condition and in its original packaging (where possible).

    Please note: For hygiene reasons, we cannot accept returns of facemasks, undershorts or underwear if the item has been removed/unsealed from its original packaging.

    If your item develops a fault or arrives damaged, please contact us first so we can resolve the issue for you as quickly as possible.

    For more information please visit our Returns & Warranty page.