Shimano Deore XT SM-CRM81 Single chainring for XT M8000 - Black

Shimano Deore XT SM-CRM81 Single Chainring for XT M8000 – Black

Upgrade your drivetrain with the Shimano Deore XT SM-CRM81 Single Chainring, engineered for riders who demand outstanding chain stability, durability, and efficiency on any trail. Designed specifically for the Shimano Deore XT M8000 crankset and fully compatible with Dyna-Sys11 HG-X11 11-speed systems, this chainring delivers precise power transfer and reliable performance across XC, trail, and all-mountain riding.

The SM-CRM81 features Shimano’s advanced Dynamic Chain Engagement (DCE) technology, offering superior chain retention and reduced risk of chain jump—even on rough, technical terrain. Its tooth profile is carefully engineered using broader, taller teeth with a hooked leading edge and alternating shapes, keeping the chain securely in place while minimising drag and reducing drivetrain noise.

Built using Shimano’s proven hollow gear construction, this chainring achieves the ideal balance of rigidity, lightweight design, and long-term durability. The plated steel teeth are supported by a strong carbon composite (CFRP) carrier body, ensuring exceptional longevity and reliable performance in harsh UK riding conditions.

Key Features

✔ Dynamic Chain Engagement (DCE) Technology

Broader and taller tooth profiles, a hooked leading edge, and alternating tooth shapes deliver:

• Superior chain retention
• Reduced risk of chain jump-out
• Lower drivetrain noise
• Increased durability
• Minimal drag for smoother pedalling

✔ Hollow Gear Construction

Engineered for an optimal balance of stiffness, reduced weight, and long-lasting durability—ideal for demanding off-road riding.

✔ Durable Steel Teeth with Carbon Composite Carrier

Plated steel teeth offer exceptional wear resistance, while the CFRP carrier body provides strength and stability without adding unnecessary weight.

✔ Fully Compatible with Dyna-Sys11 HG-X11

Designed for Shimano’s 11-speed Dyna-Sys11 drivetrains, ensuring smooth, efficient, and reliable power transfer.

✔ Optimised for XT M8000 Cranksets

A perfect replacement or upgrade for riders running a 1x XT M8000 setup.

✔ Available in 30T / 32T / 34T

Choose the ideal chainring size for your terrain and riding style.

Ideal For

• XC, trail, and all-mountain riders
• Shimano XT M8000 users needing high-performance chain retention
• Those upgrading to a more durable, quieter, and efficient 1x chainring

DELIVERY

Delivery to mainland UK addresses are free for orders over £40. Except when you choose delivery to a third party (Click and Collect) there is a charge of £5.95 to cover some of the additional cost the couriers charge for this service. If you choose to collect from Fawkes warehouse there is no shipping charge.

There will an additional charge for deliveries to Highlands and Islands. 

RETURNS TO FAWKES

Whether it’s a jersey that doesn’t fit, or the colour is not quite right, sometimes you’ll need to return items to us.

If an item is 'as new' and has not been used or fitted in any way, you can return it to us by post within 90 days of delivery for a refund. Please ensure that the goods are returned in their original packaging and are in an unused condition.

Please click HERE to print and then complete the returns form and include it inside your parcel.

If you wish you can use our Royal Mail Returns service please follow the instructions on the link below to return your parcel to us.

Royal Mail Returns Service

Please pack the item carefully to avoid damaged during shipping.

Customers need to pay the cost of return delivery unless the item is faulty and this will be deducted from your refund, currently £3.95.

If your have a large item e.g. Child seat, Bike, trailer etc. please contact our customer service team at Guy@fawkes-cycles.co.uk to arrange the best way to return your item, the cost will be deducted from your refund.

You will not receive a refund for the retail value of any free or promotional items you are sent, and you will be charged if they are not returned.

UNWANTED ITEMS

If you change your mind on your purchase, you have a full 90 days to return it for a refund. All Goods must be unused, in a saleable condition and in their original packaging with all labels still attached.

Please pack the item carefully to avoid damaged during shipping.

There are some exclusions to our 90 day returns policy, which are detailed below:

Nutritional products or those with a best before date must be returned within 28 days*

Any customised items such as wheel builds cannot be returned*

GPS systems such as sports watches or cycle computers can only be returned if unregistered*

For hygiene reasons, any intimate garments such as facemasks, underwear and swimsuits can only be returned if the items are faulty.

*Unless faulty

If you wish to return your item for a refund, please follow the returns procedure above.

We try our best to process all refunds within 14 working days. We'll refund your item via your original payment method.

You will not receive a refund for the retail value of any free items you are sent, and Fawkes may charge you for this item if you fail to return it

FAULTY ITEMS

If you feel that your purchase has developed a fault, then please contact us with photographs of the issue before returning any goods - we may be able to solve your problem without you incurring any further inconvenience.

If you find a fault with your item, send it back to us and we'll take a look at it as soon as we can. Items sent back to us will undergo an inspection and it may be necessary to send the item away to the manufacturer to confirm the fault. If we confirm a manufacturing fault, we'll happily replace or refund it.

Please pack the item carefully to avoid damaged during shipping. 

Faulty items should be returned within a reasonable time and in a clean and dry condition. PLEASE NOTE, WE WILL NOT PROCESS DIRTY ITEMS.

Please enclose all your details and a covering note explaining the fault and any other useful details.

We'll try to get back to you within 14 working days of receipt of your parcel, although during busy periods this may take slightly longer.

Your statutory rights are not affected.

We reserve the right to recharge return carriage on items where no fault is identified.

Customer Service Email: Guy@Fawkes-Cycles.co.uk

Please contact us for our Payment & Security policy.