Fly Sierra 18" Frame
Fly Sierra 18" Frame
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Fly have adapted their Sergio Layos frame to better suit younger riders, the Sierra is an exact replica of that frame that now perfectly fits riders between 7 to 11 years old.
The Sierra utilises 4130 CrMo alloythroughout the frame with Japanese Sanko Triple Butted tubing, CNC machined and heat treated headtube and bottom bracket with invest cast dropouts, seatclamp and seatstays. It's built tough for those riders progressing past more inexpensive frames.
Featuring the same design and technical specifications as the adult frame the Sierra 18 has everything you'd expect from a modern frame.
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Product Specs
- MATERIAL: 4130 Chromoly
- HEAD TUBE ANGLE: 75°
- SEAT TUBE ANGLE: 71°
- CHAIN STAY LENGTH: 12.2"
- BB HEIGHT: 10.5"
- WHEEL SIZE: 18"
- STANDOVER HEIGHT: 8"
- DROPOUT SIZE: 14mm
- HEADSET TYPE: Integrated
- BB TYPE: Euro
- BRAKE MOUNTS: Removable (Sold separately)
- GYRO TABS: None
- WEIGHT: 4.3lbs
Product Highlights
- Geometry specially designed for smaller riders
- Great all round frame for all types of riding
- High-quality Chromoly construction
- Seamless Japanese Sanko Tubing
- Built in chain tensioners
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UNDERSTANDING FRAME GEOMETRY
BMX frame geometry can look daunting, but thanks to our handy guide below you will have it figured out in no time. Remember, we're all BMXers here so if you have any questions just ask.
Keep reading to find your perfect frame, or click below to watch the buyers guide video.
FRAME SIZE CHART
Frame sizing is very much a personal preference: some riders like them longer, others shorter. Here's a rough guide - if you have any questions remember we are here to help!3ft - 3ft 8" - best suited to a 16" BMX bike
3ft 8" - 4ft - best suited an 18" BMX bike
4ft - 5ft - 18" to 20" top tube
5ft - 5ft 4" - 20" to 20.25" top tube
5ft 4" - 5ft 8" - 20.25" to 21" top tube
5ft 8" - 6ft - 21" to 21.25" top tube
6ft plus - 21" top tube or longer
Rider Height (in) | Rider Height (cm) | Top Tube Length |
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5' | 152 | 20" |
5'3" | 160 | 20.5" |
5'6" | 167 | 20.75" |
5'9" | 175 | 21" |
6' | 182 | 21.25" |
6'6" | 200 | 21.5" |
FRAME GEOMETRY
Frame geometry can take a bit of understanding - but here at SourceBMX we are here to help! The first thing to understand is that BMX frame sizing is best measured by the length of the top tube - shown here as TT. Keep reading on to understand how the angles change how your frame will feel!![](http://eu.sourcebmx.com/cdn/shop/files/frame-geometry.jpg?v=1684415260)