Head tube angle determines the angle of your forks. A steeper HT (i.e 75°and higher) will make the bike turn quicker than a mellower angle (i.e 74.5 and lower°). The more responsive the frame, the more twitchy it will feel, especially at highspeed!
For Volumes 20th anniversary they wanted to bring back a classic frame. Brian Castillo’s signature Dinosaur! This frame originally came out in 2001! Brian knew what he wanted back then, with it only being available in a 20.5” top tube (Exactly as he rode it himself) and dropouts borrowed from a previous years Volume frame. Even today, Brian’s influence on bmx still shows in riders around the world, whether they know it or not.
This frame has evolved over the years and is now available in black chrome with a 21” top tube. The frame features a double butted front triangle with top and bottom gussets for added strength, wider bottom bracket shell for bigger tyre clearance, 13” chainstay (slammed), 9.25” standover, classic solid 5mm thick dropouts, removable seatstay brake mounts, built in seat clamp, CNC’d seatstay bridge and a classic wishbone chainstay junction!
Despite its decals and subtle hints of the popular mid school bmx era, all the way from the streets to the trails, this beauty has all the modern goodies you could want.
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NEED SOME HELP 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, and remember we're all bmxers here, so if you have any questions just ask.
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 - 4ft - best suited to a 16" or 18" wheeled 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
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 and check out our sizing chart below!
Headtube Angle (HT)
Chain Stay Length (CS)
The chain stay is essentially the length of the rear end of the bike. A shorter CS length will make the bike more responsive and a longer one more stable. As a rough guide a 13.5" long chain stay is about average.
Seat Tube Angle (ST)
Seat tube angles don’t vary too much (around 71°) and affect the centre of gravity. The steeper the angle the shorter your bike will feel. Some frames have a mellower seat tube angle (example 69˚) which makes for a longer frame without actually being longer and reduces how fast your frame turns.
Stand Over Height (SO)
Standover height is essentially how high your frame is. A frame with a low standover height is more responsive and easier to ‘throw around’ whilst a high SO height is more stable; particularly useful when going fast.