The GT Speed Series Pro XL 24 Frame is a black and blue mountain bike frame with a matte finish, featuring a Speed Metal tube set in the main triangle, seat tube, and rear triangle, shown against a white background.

Highlights

  • Speed Metal tube set
  • Set up for disc
  • Quick Change dropout system
  • Tapered integrated head tube

Description
The GT Speed Series Pro frames feature our Speed Metal tube set to keep the weight down while maintaining the stiffness wanted to take the hole shot. Equipped with disc brakes for fast stopping after the finish sprint and spec'd to give you the confidence to chase the top step out of the box. 
Speed Alloy Frame with Quick Change Dropouts

Features
  • Speed Metal tube set. Formed and butted 6061-T6 alloy tubes keep the weight down while holding the stiffness you want to take the hole shot.
  • Set up for disc. Runs a 140mm disc for fast stopping after the finish sprint.
  • Quick Change dropout system. 15mm CNC and forged alloy dropouts make wheel changes straightforward at the track.
  • Tapered integrated head tube. A 1-1/8" to 1.5" integrated head tube, so a current tapered race fork drops straight in.
  • GT Speed Series MK7 Elite Race. Spec'd to give you the confidence to chase the top step straight out of the box.

Specifications
  • Sizes: Pro XL
  • Bottom bracket: BB86
  • Material: 6061-T6 aluminium
  • Tubing: Alloy formed and butted Speed Metal tubes
  • Dropouts: 15mm alloy CNC/forged Quick Change disc dropout system
  • Brake mounts: Disc, compatible with 140mm
  • Head tube: Tapered 1-1/8" to 1.5" integrated
  • Wheel size: 24"

GT Speed Series Pro XL 24 Frame

Brand: GT SKU:

From

$299.99 AUD

 $899.99 AUD

Or 4 payments of $74.99 AUD with

Colour - Black

Top Tube Length - 21.75

BMX race bike sizing

Race frames are sized by class, and the class you ride is set by rider height rather than age.

SizeRider heightTop tube
Micro (18" wheels)Under 110cm16.25"
Mini (20" wheels)110 to 125cm17 to 18"
Junior120 to 140cm18.25 to 18.75"
Expert135 to 155cm19.5 to 19.75"
Expert XL150 to 165cm20 to 20.75"
Pro160 to 170cm20.25 to 20.75"
Pro XL165 to 175cm21 to 21.25"
Pro XXL170 to 185cm and up21.5 to 21.85"
Pro XXXL175 to 185cm and up22"
Pro XXXXL185cm and up22.5"
Cruiser (24" wheels)175cm and up21.5" and up

Heights overlap between bike sizes on purpose. If you fall in two size categories, a growing rider new to racing is usually better suited to the larger bike, a experienced rider who wants the bike to more responsive should err on the smaller size. Some brands label the Pro size Pro L, with the same fit.

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. Just don't guess their height either, you know how fast they can grow!

Here are some tips

  • Between two sizes and still growing? Take the larger size, but make sure you check the top tube length of the bike. The length of top tube for a given size (Expert XL as an example) can vary up to a half inch or more across brands. Most Expert XL frames are 20", but we've seen them as long as 20.7"
  • Experienced racer and wanting the bike to be more responsive? Take the smaller size. You want the bike to be "under you", not a stretch to the bars and cranks.
  • Top tube is the number that actually changes the fit, so compare it against the bike they ride now.

Still not sure? We're the experts and size bikes for riders every day of the week. Our team has decades of experience between them and will help you decide which bike is the right fit based on rider height and racing experience.

Read the full buying guide

BMX race bike sizing

Race frames are sized by class, and the class you ride is set by rider height rather than age.

SizeRider heightTop tube
Micro (18" wheels)Under 110cm16.25"
Mini (20" wheels)110 to 125cm17 to 18"
Junior120 to 140cm18.25 to 18.75"
Expert135 to 155cm19.5 to 19.75"
Expert XL150 to 165cm20 to 20.75"
Pro160 to 170cm20.25 to 20.75"
Pro XL165 to 175cm21 to 21.25"
Pro XXL170 to 185cm and up21.5 to 21.85"
Pro XXXL175 to 185cm and up22"
Pro XXXXL185cm and up22.5"
Cruiser (24" wheels)175cm and up21.5" and up

Heights overlap between bike sizes on purpose. If you fall in two size categories, a growing rider new to racing is usually better suited to the larger bike, a experienced rider who wants the bike to more responsive should err on the smaller size. Some brands label the Pro size Pro L, with the same fit.

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. Just don't guess their height either, you know how fast they can grow!

Here are some tips

  • Between two sizes and still growing? Take the larger size, but make sure you check the top tube length of the bike. The length of top tube for a given size (Expert XL as an example) can vary up to a half inch or more across brands. Most Expert XL frames are 20", but we've seen them as long as 20.7"
  • Experienced racer and wanting the bike to be more responsive? Take the smaller size. You want the bike to be "under you", not a stretch to the bars and cranks.
  • Top tube is the number that actually changes the fit, so compare it against the bike they ride now.

Still not sure? We're the experts and size bikes for riders every day of the week. Our team has decades of experience between them and will help you decide which bike is the right fit based on rider height and racing experience.

Read the full buying guide

GT Speed Series Pro XL 24 Frame - Black / 21.75

Discount 67%

Instead of $899.99

$299.99 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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