Harrelson Trumpets
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Order Here
5MM Backbore Size Reference: Trumpet, Cornet, Flugelhorn, Custom

The 5MM Backbore is an extension of the Throat that determines tonal color, intonation and projection pattern. 5MM Backbores are available in over 100 size variations.
* Extended length backbores available to adjust gap (call to order)

Most standard mouthpieces have backbore measurements in the following range:
Beginning Diameter = .20 to .22 inches
End Diameter = .31 to .35 inches

A 3C backbore is typically .21 by .33 inches and is designated as 21.33 as in the example illustration.


Need help with sizes and options? Call us at 303.657.2747 or email harrelsontrumpets@gmail.com to discuss your needs with our team of experts.




Getting Started
The easiest way to get started in the 5MM System is to choose a Rim close to your current mouthpiece.
To save you time and energy, you may order your 5MM by simply telling us which brand and size options you prefer and we will do all the cross reference work to get your mouthpiece built right the first time. It is not necessary to learn our sizing system.

1) Order based on your current size
2) Build your own size
3) Test any 5MM variations in our shop to find the perfect setup

Understanding Size options
Beginning Diameter - First
2 digits, dimension of the ID top in hundredths of an inch, must match Throat end diameter
End Diameter - Second 2 digits, measured at the very bottom diameter



Location

Have questions?

Send an email by clicking the envelope icon to the right. Or call ahead and visit us for an in-person lesson or tour. 303.657.2747

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  • Performance
    • SpectraTone
    • Build My Mouthpiece >
      • Intro to Mouthpieces
      • Artist Series >
        • Artist Bodies
        • Artist Rims
    • Mouthpiece Components >
      • Rim Sizes
      • Cup Sizes
      • Throat Sizes
      • Body Sizes
      • Backbore Sizes
      • Nut Sizes
    • Increase Efficiency >
      • Mod Kits
      • Finger Button Options
    • Adjustable Performance
    • Adjustable Peformance Tools
  • Advantage
    • Trumpet Momentum >
      • Trumpet Momentum Level 1 >
        • TM 1 - Blog
        • TM 1 - Assessments
        • TM 1 - Exercises
      • Trumpet Momentum Level 2 >
        • TM 2 - Blog
        • TM 2 - Assessments
        • TM 2 - Exercises
        • TM 2 - Beta Testing
      • Trumpet Momentum Level 3 >
        • TM 3 - Blog
        • TM 3 - Assessments
        • TM 3 - Exercises
        • TM 3 - Beta Testing
        • TM 3 - Case Studies
        • TM 3 - Regional Clinics
    • The Harrelson Story
    • We have Your size
    • Technology
    • 100% Guarantee
  • Instruments
    • Model Comparison
    • Buy A Harrelson
    • Muse Modular MMXX
    • 2021 VPS Summit G-Series
    • "X" Series
    • Limited Editions >
      • Summit One
      • Summit Midnight
      • Summit Art
    • Bravura Series >
      • 2021 Bravura Flugelhorn
      • 2021 Bravura Piccolo
    • 2018 VPS Summit Series
    • HT6 - Kickstarter 2022
    • VPS Summit Eb
    • Acoustic Armour
    • Trumpet Gallery
  • News
    • Jason's Blog >
      • Jason Harrelson
    • Lessons Link
    • Teacher Information
    • Weekly Trumpet Challenge
    • Get Social
    • Clinics & Tours
    • Our Clients >
      • Client Features
    • Jen's Blog
    • Company History
  • Clients
    • Contests & Winners
    • Order My Trumpet >
      • Leadpipes & Bells
      • Tuning Slides & Bell Crooks
      • Receivers
      • Bottom Cap options
      • Water Keys
    • Contact Us
    • Shipping
    • Instrument Registry
    • Acclimation
    • Maintenance
    • Roots of Music
  • Store