The Details

If your doubtful about going 1x10 due to the lack of hill climbing options, then the e*thirteen Range Extender Cog is for you. With its massive size (40T), the cog is designed to replace your 15/17T cog in the middle of your cassette to create the ultimate hill climbing gear.

The advantages of using this cog are clear: less weight, no more front mech and smoother gears without the massive price tag of the latest 1x specific drivetrains.

An EXA+ anodised aluminium construction helps to resist flex under heavy power and has been shaped to work exclusively with Shimano cassettes with a 34T cog for perfect shifting performance.

Our Verdict

Who says you need Sram's fancy XX1 or X01 to have a wide range cassette, e*thirteen have created the perfect cog to add to your 10 speed cassette to increase your climbing prowess.

Key Specifications

  • Cog Material - EXA+ Aluminum
  • Thickness - 5mm
  • Compatibility - 10 Speed
  • Ring Size - 40T
  • Colours - Blackout, Red, Blue
  • Weight - 70g

Delivery

Parts, accessories and clothing delivery - FREE over £30

Delivery for parts, accessories and clothing is free over £30 and £2.99 below that. We have a selection of premium delivery services available, including next day, AM, Saturday, timed delivery and local pickup services. Mainland UK only, some remote and off-shore areas or areas of Scotland may incur a surcharge. Delivery options and lead time estimates will be provided in checkout.

Click & Collect

Our Click & Collect service offers all the benefits of shopping online, combined with an award-winning retail experience in one of our stores. Simply order your items, select Click & Collect and pick up your item at a time that's convenient for you - our stores are open 7 days a week. Best of all, the service is completely free.

Reviews

Your Questions Answered

If your doubtful about going 1x10 due to the lack of hill climbing options, then the e*thirteen Range Extender Cog is for you. With its massive size (40T), the cog is designed to replace your 15/17T cog in the middle of your cassette to create the ultimate hill climbing gear.

The advantages of using this cog are clear: less weight, no more front mech and smoother gears without the massive price tag of the latest 1x specific drivetrains.

An EXA+ anodised aluminium construction helps to resist flex under heavy power and has been shaped to work exclusively with Shimano cassettes with a 34T cog for perfect shifting performance.

  • Cog Material - EXA+ Aluminum
  • Thickness - 5mm
  • Compatibility - 10 Speed
  • Ring Size - 40T
  • Colours - Blackout, Red, Blue
  • Weight - 70g

Who says you need Sram's fancy XX1 or X01 to have a wide range cassette, e*thirteen have created the perfect cog to add to your 10 speed cassette to increase your climbing prowess.

Parts, accessories and clothing delivery - FREE over £30

Delivery for parts, accessories and clothing is free over £30 and £2.99 below that. We have a selection of premium delivery services available, including next day, AM, Saturday, timed delivery and local pickup services. Mainland UK only, some remote and off-shore areas or areas of Scotland may incur a surcharge. Delivery options and lead time estimates will be provided in checkout.

Click & Collect

Our Click & Collect service offers all the benefits of shopping online, combined with an award-winning retail experience in one of our stores. Simply order your items, select Click & Collect and pick up your item at a time that's convenient for you - our stores are open 7 days a week. Best of all, the service is completely free.