{{ 'fb_in_app_browser_popup.desc' | translate }} {{ 'fb_in_app_browser_popup.copy_link' | translate }}

{{ 'in_app_browser_popup.desc' | translate }}

FREE Delivery on orders over $300

Your Shopping Cart is empty.
{{ (item.variation.media ? item.variation.media.alt_translations : item.product.cover_media.alt_translations) | translateModel }} {{ (item.variation.media
                    ? item.variation.media.alt_translations
                    : item.product.cover_media.alt_translations) | translateModel
{{ 'product.bundled_products.label' | translate }}
{{ 'product.bundle_group_products.label' | translate }}
{{ 'product.buyandget.label' | translate }}
{{ 'product.gift.label' | translate }}
{{ 'product.addon_products.label' | translate }}
{{ field.name_translations | translateModel }}
  • {{ childProduct.title_translations | translateModel }}

    {{ getChildVariationShorthand(childProduct.child_variation) }}

{{ 'product.set.open_variation' | translate }}
  • {{ getSelectedItemDetail(selectedChildProduct, item).childProductName }} x {{ selectedChildProduct.quantity || 1 }}

    {{ getSelectedItemDetail(selectedChildProduct, item).childVariationName }}

{{item.quantity}}x HK$0 {{ item.unit_point }} Point
{{addonItem.product.cover_media.alt_translations | translateModel}}
{{ 'product.addon_products.label' | translate }}
{{addonItem.quantity}}x {{ mainConfig.merchantData.base_currency.alternate_symbol + "0" }}
AMS Crank Defender

AMS Crank Defender

(only Hong Kong) free shipping on orders over HKD$300 on order

(outside Hong Kong) free shipping on orders over USD$300 on selected categories

{{ productService.variationPriceMemberTag(variationSelected) }}
{{shoplineProductReview.avg_score}} {{'product.product_review.stars' | translate}} | {{shoplineProductReview.total}} {{'product.product_review.reviews' | translate}}
{{amazonProductReview.avg_rating}} {{'product.product_review.stars' | translate}} | {{amazonProductReview.total_comment_count}} {{'product.product_review.reviews' | translate}}
{{ title.name_translations | translateModel }} : {{variationName[$index] | translateModel}}
Add to Wishlist
The maximum quantity per submit is 99999
This quantity is invalid, please enter a valid quantity.
Sold Out

Not enough stock.
Your item was not added to your cart.

Not enough stock.
Please adjust your quantity.

{{'products.quick_cart.out_of_number_hint'| translate}}

{{'product.preorder_limit.hint'| translate}}

Limit {{ product.max_order_quantity }} per order.

Only {{ quantityOfStock }} item(s) left.

Please message the shop owner for order details.
Add to Wishlist

The AMS bike crank protection is a great way to protect your bike crankset from the wear and tear that it would endure if you were to ride on without protection. Mtb and gravel riders can greatly benefit from using crank arm protection that effectively prevents damage and scratches.


They are made of durable TPU ensuring your cranks stay well protected if they ever hit hard stone while pedaling through a rocky trail or a technical climb. Simply put them on in your favorite color, and off to the trail.


Crank arms are an important and often expensive part of your bike you need to protect, and if you are used to putting a lot of miles on your bike on rough terrains, you know that cranks are constantly exposed to damage.


Our bike crank guard recomendations

We recommend using crank defenders in combination with our high-impact and rub-resistant crank guards for optimal protection of your cranks against rocks, debris, and hard impacts. Your precious carbon or aluminum crankset will be well protected in just a few steps.


It is also in your best interest to use proper crank protection to preserve the value of your investment; our crank defenders will perverse the resale value of your crankset once you are done using it.


How to install crank arm protection

Our crank protection has been designed to work with most carbon cranks in the market as well as some aluminum cranks. You can check our compatibility list to verify the ones we’ve tested compatibility on.  The crank defenders are very easy to install; simply uninstall your pedals with your Allen hex wrench as required and slide the defenders in making sure they are straightened and well-positioned. Finally, clean up your pedals, lubricate the threads as needed, and reinstall. Our installation page has some great tips to help you install your crank defenders quickly and easily.


Benefits of using crank defenders

AMS bike crank defenders are ideal to protect your bike's carbon or aluminum crankset from impacts and scratches while adding additional style to your cranks. You can gain the following benefits from using AMS crank protection:

l   Our crank defenders are durable and strong; these defenders can withstand lots of impacts for miles to come; the stretchy TPU material easily bounces off any rocks and debris that may hit your cranks leaving them untouched.

l   AMS crank defenders are tightly fitted on your cranks, so there’s no chance of dirt or debris getting in between that can damage or scrape your crank arm.

l   No need to worry about extra weight; our crank defenders are light and won’t absorb water or mud.

l   There are different colors to choose from. Add a stylish touch to your cranks!

l   No installation hazards. You will gain protection for your cranks quickly and easily.

l   As opposed to other brands which only offer a boot to cover the tip of the cranks; Our defender includes an additional TPU insert to extend the protective area.


Impact&scratch protection.

Extra protection and added style on the crank arm.

Fits most carbon and some aluminium cranks. Check compatibility list.

Durable and strong.

Light and doesn't absorb water or mud.

Tight fit to avoid debris between defender and crank arm.

Made in EU



TPU material

18 grams (0.63oz)

Internal measures: 34mm x 15mm. It can stretch to 38mm




One of the main features of our honeycomb, adhesive PVC frame guard is the easy installation, as it provides good ability to adapt to simple curves, as well as repositioning possibilities while installing. Follow this instructions for a PRO finish and durability:


1. Identify the area to protect and proceed to install in a warm area (avoid installing at temperatures lower than 12ºC/ 53 F)


2. Clean the area to protect from dust, mud and debris as well as from rest of oils, or silicones, using alcohol or similar. Use only alcohol or alcohol derivatives. Do not use supermarket cleaners, as they have silicones that are the worst enemy of adhesives.


3. Apply gently the Frame Guard, rubbing with your hand to help it adapt. While the glue is still fresh, you can reposition it if you placed it badly the first time.


4. Apply pressure evenly around all the surface to help for a better adhesion


5. Let it bond for some hours, and go use it!!!


We use a strong automotive-grade adhesive, so for removal, we recommend using a hairdryer or heatgun to soften the adhesive and PVC and to facilitate the operation

Additional details
Shipping & Payment

Delivery Options

  • SF Express (Commercial and residential address)
  • S.F. Express - Store Pickup
  • S.F. Express - EF Locker Pickup
  • S.F. - Business Station
  • Pickup at store (Hong Kong)
  • International Shipping (Taiwan)
  • International Shipping

Payment Options

  • Credit Card (*Tap & Go available)
  • PayPal & Credit Card
  • Apple Pay
  • Alipay (HK)
  • Alipay (China)
  • WeChat Pay
  • FPS
  • Bank Transfer
  • Pay at store
Customer Reviews
{{'product.product_review.no_review' | translate}}