The ION BMX Ti18 Titanium 18 Inch Frame is a sleek youth BMX frame, shown without wheels, seat, or handlebars, set against a plain white background.
Close-up of the ION BMX Ti18 Titanium 18 Inch Frame showing its metallic finish, visible welds, and engraved alphanumeric text on the tubing.
A close-up of the ION BMX Ti18 Titanium 18 Inch Frame’s head tube displays its black "BOO" logo and precise detailing, highlighting it as an ideal youth BMX bike frame against a white background.
Close-up of the ION BMX Ti18 Titanium 18 Inch Frame, highlighting its silver titanium finish, detailed welds, bottom bracket area, and an engraved serial number on the seat tube.
Close-up of the ION BMX Ti18 Titanium 18 Inch Frame, highlighting the head tube and two welded tubes with a brushed titanium finish and visible machining marks.
Close-up of the ION BMX Ti18 Titanium 18 Inch Frame, highlighting its clean welds, minimalistic design, and precision-crafted dropout and chainstay.
Close-up of the ION BMX Ti18 Titanium 18 Inch Frame head tube featuring precision welds and a minimalist front-etched logo.
Close-up of the ION BMX Ti18 Titanium 18 Inch Frame, showcasing its silver finish, welded joints, tubing, and engraved details including "ION BMX" and frame specifications.
Close-up of three metal adjustable wrenches with open jaws, aligned diagonally on white—perfect for tuning your ION BMX Ti18 Titanium 18 Inch Frame and keeping your BMX in top condition.
Close-up of the ION BMX Ti18 Titanium 18 Inch Frame seat clamp area, highlighting detailed welding and the seat post clamp bolt.

Highlights

  • Aerospace grade titanium build
  • Around 1200g
  • Geometry built for progression
  • 14mm slotted dropouts

Description

ION BMX Ti18 Titanium 18” Frame

The ION Ti18 is a pure performance platform built for young riders who are ready to push harder, go faster, and ride longer. Crafted in an oxygen free/argon purged environment from certified aerospace-grade Gr5 Ti-6Al-4V titanium (headtube, bottom bracket, and dropouts) and Gr9 Ti-3Al-2.5V Titanium (tubing), the Ti18 delivers the perfect balance of stiffness, strength, and ultra-low weight—giving riders an edge whether they’re blasting transitions, hitting street lines, or carving dirt.

The geometry is all about control and progression. With an 18” top tube, 11.6” chainstay, and a steep 75° head tube angle, the Ti18 offers razor-sharp responsiveness while maintaining the stability needed for speed and flow. Titanium’s natural vibration-damping qualities reduce fatigue, letting riders stay locked in for longer sessions with maximum precision.

This isn’t just a smaller frame—it’s the future of BMX performance, scaled to perfection for the next generation.

Features
  • Aerospace grade titanium build. Certified Gr5 Ti-6Al-4V head tube, bottom bracket and dropouts, with Gr9 Ti-3Al-2.5V titanium tubing through the rest.
  • Around 1200g. About half the weight of equivalent size frames on the market, with no give in stiffness or strength.
  • Geometry built for progression. An 18" top tube, 75° head tube angle and 11.6" chainstay make it fast, responsive and confidence inspiring.
  • 14mm slotted dropouts. Integrated tensioners keep chain alignment spot on and make wheel adjustment quick.
  • Smooths out the ride. Titanium damps vibration by nature, which cuts fatigue and lets a young rider stay locked in for longer sessions.

Specifications
  • Top tube: 18"
  • Chainstay: 11.6"
  • Head tube angle: 75°
  • Bottom bracket height: 10.5"
  • Bottom bracket: Mid
  • Material: Gr5 Ti-6Al-4V titanium head tube, bottom bracket and dropouts
  • Tubing: Gr9 Ti-3Al-2.5V titanium
  • Dropouts: 14mm slotted, integrated tensioners
  • Brake mounts: U-brake
  • Weight: Approximately 1200g

ION BMX Ti18 Titanium 18 Inch Frame

Brand: ION BMX SKU:

$1,599.99 AUD

Or 4 payments of $399.99 AUD with

Colour - Titanium

Top Tube Length - 18

18 inch BMX sizing

An 18 inch bike suits a rider of about 122 to 147cm, usually 7 to 11 years old, on an 18 to 18.5 inch top tube. It is the last step before a full size 20 inch.

Rider heightWheel sizeTop tube
60 to 91cm12"12 to 12.5"
81 to 106cm14"14 to 14.5"
96 to 122cm16"16 to 16.5"
122 to 147cm18"18 to 18.5"
147 to 157cm20"19.75 to 20.25"
157 to 168cm20"20 to 20.5"
168 to 175cm20"20.25 to 20.75"
175 to 183cm20"20.5 to 21"
183 to 190cm and up20"20.75 to 21.5"
160cm and up22"21 to 22.25"
160cm and up24"21.75 to 22"
160cm and up26"22 to 23"

Sizes overlap on purpose, so personal preference comes into it. If your rider is near 147cm and still growing, look at a 20 inch instead: it is the size they will keep riding.

How to measure

Stand your rider against a wall in the shoes they ride in, heels flat, and mark the top of their head. Measure from the floor to the mark.

  • Between an 18 and a 20? Take the 20. It is the size they will keep riding, and an 18 gets outgrown quickly.
  • They should be able to stand over the top tube with both feet flat on the ground.

Not sure? Send us their height and we will tell you what we would put them on.

Read the full buying guide

18 inch BMX sizing

An 18 inch bike suits a rider of about 122 to 147cm, usually 7 to 11 years old, on an 18 to 18.5 inch top tube. It is the last step before a full size 20 inch.

Rider heightWheel sizeTop tube
60 to 91cm12"12 to 12.5"
81 to 106cm14"14 to 14.5"
96 to 122cm16"16 to 16.5"
122 to 147cm18"18 to 18.5"
147 to 157cm20"19.75 to 20.25"
157 to 168cm20"20 to 20.5"
168 to 175cm20"20.25 to 20.75"
175 to 183cm20"20.5 to 21"
183 to 190cm and up20"20.75 to 21.5"
160cm and up22"21 to 22.25"
160cm and up24"21.75 to 22"
160cm and up26"22 to 23"

Sizes overlap on purpose, so personal preference comes into it. If your rider is near 147cm and still growing, look at a 20 inch instead: it is the size they will keep riding.

How to measure

Stand your rider against a wall in the shoes they ride in, heels flat, and mark the top of their head. Measure from the floor to the mark.

  • Between an 18 and a 20? Take the 20. It is the size they will keep riding, and an 18 gets outgrown quickly.
  • They should be able to stand over the top tube with both feet flat on the ground.

Not sure? Send us their height and we will tell you what we would put them on.

Read the full buying guide

ION BMX Ti18 Titanium 18 Inch Frame - Titanium / 18

$1,599.99 AUD

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$12.99 flat-rate shipping Australia-wide

Express from $21.99

Free in-store pickup - Brisbane

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