Product Description

1-1/8" Straight Lefty 2.0 / Supermax Adapter $90.00
Tapered Lefty 1.0 Adapter $95.00

Clamp-On Lefty Adapter

$200.00

  • For use on non-Cannondale frames with straight 1-1/8” head tubes
  • For use with adjustable clamped crown Leftys ONLY
  • Forged steerer tube
  • Measure your stack height before ordering!
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Product Description

Did you know that Project 321 was the first to manufacture an adapter for Leftys? Owner and lead designer, Jake Liles believed that the Lefty was superior to many other forks on the market at the time. He wanted the stiffness, strength and weight savings of a Lefty on his Giant AC but due to the larger head tube size that Cannondale designed the Lefty to fit, this was impossible.  Temporarily impossible, at least. Jake decided to make this happen for himself not knowing he was becoming the leader of a movement that includes Cannondale now producing their own ‘Lefty For All’ adapter.

This adapter allows use of a clamped crown Lefty on a non-Cannondale frame with a straight 1-1/8” head tube.

Collars are CNC machined here in the USA and the steerer tube is forged for additional strength.

Bottom collar comes pressed onto steerer and is not adjustable.

Top collar is adjustable and moves easily up and down the steerer until it is installed.  (Collars must be kept within a specified stack height range: Short is 5.3” – 5.75” and Tall is 5.675” – 6.125”).

Clamp-On Lefty Adapter

  • Two sizes available (Short and Tall) – you will need to know your stack height to determine which is right for you.  See the stack height description page for information on how to measure your stack height.
    • Short has a stack height range of 5.3” – 5.75”
    • Tall has a stack height range of 5.675” – 6.125”
  • Weight before steerer tube is cut is 538g for the Short and 542g for the Tall
    • Weight is 460g when cut to same length as Cannondale steerer.
  • Allows use of clamped crown Leftys on frames with 1-1/8” head tubes.
  • Torque Specs: M6 bolts 12-13 Nm and M5 bolts 6-7 Nm.
  • 5 year warranty against any manufacturing defects (applies to original owner only)

Tech Videos:

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How long is the steerer tube?
 This adapter is 274mm (10.79”) before it is cut from the crown race up.
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How do I cut the steerer tube?
As the saying goes: Measure twice and cut once! Determine your cut length (which is based on your stack height) then make the cut. You can use a hacksaw to cut, we recommend that it have a saw guide to hold the steerer tube.
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Can this adapter be used on a frame with a tapered head tube?
No, unfortunately this adapter cannot be used on a tapered head tube.
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Can this adapter be used with a Lefty that has fixed crowns?
No, this adapter is only for Lefties that do not have their clamps bonded on.
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How is this product shipped?
We offer FREE SHIPPING (within the USA) on this product via USPS unless otherwise requested or shipped with other items. (changes may be subject to price increase).
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Can I ship to a different address from my billing address?
Unfortunately, No. For security reasons Project321 will only ship to the billing address or address associated with the PayPal account used to purchase the item. PayPal does allow the addition of multiple addresses on an account.

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