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SKU: TL8656

Park Tool 789 Head Tube Reamer Replacement Bit 55.95mm for ZS56, EC56, Fits HTR-1 & 690-XXL Facing Cutter - Precision Machined Steel, Compatible with Headset Installation & Reaming, for Bicycle Head Tube & Steerer Tube Maintenance

Regular price $154.98
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This is a pre order item. We will ship it when it comes in stock.

$10 Gift Card

at 250 points

$25 Gift Card

at 500 points

$75 Gift Card

at 1,000 points

Description

Upgrade your bicycle maintenance toolkit with the Park Tool 789 Head Tube Reamer Replacement Bit 55.95mm - the essential accessory for precise head tube reaming and optimal headset fit. Designed specifically for professional bike shops and avid cyclists alike, this high-quality replacement bit ensures accurate, clean, and consistent reaming to 55.95mm I.D., perfectly accommodating "internal" headset cups with a 55.99-56.04mm O.D., compatible with ZS56 and EC56 standards.

Constructed from durable, high-grade materials, the Park Tool 789 Reamer Bit guarantees both longevity and reliable performance during demanding bike rebuilds and customizations. Its engineering is optimized for compatibility with the renowned Park Tool 690-XXL Facing Cutter and 750 Centering Cone Adapter, making it an indispensable component for maintaining precise head tube dimensions on both upper and lower tubes.

This versatile reaming bit is ideal for professional bike shops, frame builders, and serious cycling enthusiasts seeking to achieve flawless headset integration, reduce installation errors, and improve overall bike handling. Its innovative design facilitates smooth, efficient reaming processes-saving time while enhancing the quality of your bike builds and repairs.

Whether you're working on modern mountain bikes, road bikes, or custom frames, the Park Tool 789 Head Tube Reamer Replacement Bit 55.95mm is your go-to tool for ensuring impeccable head tube diameters and a perfect fit for ZS56 and EC56 headset systems. Elevate your bike servicing with this precision-engineered component, engineered to deliver professional results every time.

  • Precision Reamer Bit crafted from hardened steel for durable and accurate head tube reaming, ensuring perfect headset fit and smooth steering performance.
  • Engineered to ream head tube I.D. to 55.95mm, compatible with standard ZS56 and EC56 headset components for seamless integration and reliable operation.
  • Designed for use with the Park Tool 690-XXL Facing Cutter and 750 Centering Cone Adaptor, providing professional-grade maintenance for bike shop and DIY bicycle builds.
  • Ideal for upgrading or restoring road, mountain, or gravel bikes, this replacement bit ensures precise head tube preparation for improved steering stability and rider confidence.
  • Compatible with head tubes of both upper and lower positions, this versatile reamer bit is an essential tool for bike workshops focusing on quality craftsmanship and component accuracy.
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We pride ourselves on our ability to ship and deliver your gear with excessive speed! We ship from 22 locations throughout the United States and most orders will arrive in 3 days or less with Free Shipping on orders over $75!

The nitty gritty, for specific delivery timelines please pay attention to the delivery timelines on the product pages and the time frame estimated in the carts. If you need a part by a specific day, please contact us by chat, phone, or

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Most orders placed during the workweek before 1:00 PM Eastern time ship the same day, but during peak/holiday season or depending on inventory location handling time can take up to 48 hours. If you have questions regarding shipping estimates, don't hesitate to get in touch with us before placing the order. There is a direct signature requirement for all orders over $500.

We provide the you the ability to utilize multiple shipping & billing addresses, based upon what fits your current needs. However you are responsible to maintain and update any new address changes, as 365 Cycles will not be held liable for orders being shipped to an incorrect address.

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If you need to return your order please email us at info@365cycles.com, call us at 603-968-5797, or use the live chat on our site.

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365 Cycles puts the customer above everything. Our number one goal is your satisfaction. When you press the shift lever you want the gears to shift, and when you buy bicycle parts, you want the bicycle parts to arrive on time in new condition. With over 60,000 products and 22 warehouse locations throughout the country, we have the parts you need and they are coming in hot!

Living an active lifestyle is just that, a lifestyle that never goes away and our goal is to always exceed your expectations so we can take this lifelong journey together. We strive to have the parts you need, at competitive prices with unmatched shipping speeds!

If there is ever an issue with an order we will work at warp speed to fix our mistake and make sure you never go a day without a bicycle! If you are not receiving the quality of service you need from one of our exceptionally qualified bicycle experts, tell them Ben Berman told you to tell them "Customer Loyalty" and then name your terms.

Our team is waiting to help you 7 days a week and they are more qualified to help than I am but if you ever feel like you're not getting the service you need I’m personally asking you to email me at ben@365cycles.com with "CUSTOMER LOYALTY" in the title and I will personally handle your order.

Over the years we have served millions of satisfied customers and continue to serve many of them today. With your feedback, we are confident we can take this lifelong journey together and build a friendship that goes beyond parts and accessories.

“If you want to go fast, go alone, if you want to go far, go together.” -Someone Smart

Ben Berman Founder & CEO of 365 Cycles


Company Core Values: 

These were established by the members of our team and we use them every week to call out team members who have shined in one of these areas. Feel free to let us know at info@365cycles.com if someone you worked with has gone above and beyond in one of these areas. 

Customer Loyalty

Put yourself in their shoes and support those who support us.

You Control the Outcome

If it is to be, it’s up to me" You are personally responsible for controlling the outcome.

Seek Understanding

Understanding the answer is more important than the answer.

Progress Not Perfection

Pick a direction, analyze the results, and be willing to change course.

Will to Win

Customers, 365 Team, Partners, all need the will to win. Bring the Will to Win to every conversion.

Keep Moving

Move the body, move the mind, and remove any hurdles to achieving an active lifestyle.

Do the Right Thing:

Doing the right thing is more important than doing the thing right.

Stronger together:

If you want to go fast, go alone, if you want to go far, go together. Get your team involved and become stronger together.

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