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4Down

UNITED MARTINEZ FC 21" GLOSS BLACK

£629.99

SPECIFICATIONS

Colour: Gloss Black
Top Tube Length: Length 21”
Frame: Full Cr-mo Frame With Removable Brake Mounts Integrated Head Tube, Mid Bb, Embossed Logo Gussets
Geo: Ht 75, Cs 13.25”, So 9”, Bb 11.8”, St 71
Forks: Full Cr-mo, 1pc. Steerer Tube With Integrated Bearing Race, Tapered Legs With Angled End Caps
Handlebars: 9” X 28.5” Full Cr-mo - 1° Up Sweep 12° Back Sweep
Grips: United Team Grips With Push In Bar Ends
Headset: United Integrated Sealed
Stem: United Supreme Top Load 50mm Reach
Rear Lever: Alloy
Rear Brake: 990
Cranks: 3pc. 175mm Heat Treated, 8 Spline With United Stamped Logo
BB: United Sealed Bearning Mid
Sprocket: 25t Steel
Pedals: United Supreme Nylon Pedals
Chain: X410
Rear Rim: Alloy 36h Single Wall
Front Rim: Alloy 36h Single Wall
Rear Hub: 36h Sealed United Supreme Freecoaster 14mm Axle 9t Driver
Front Hub: 36h Sealed United Supreme Front Hub 10mm Female Axle
Rear Tyre: United Direct Tyre 20” X 2.4” - 65 Psi
Front Tyre: United Direct Tyre 20” X 2.4” - 65 Psi
Seat: United Padded Seat/post Combo
Seat Clamp: Alloy
Pegs: X4 United Stealth Plastic Pegs 110mm

 

COMPLETE BMX BIKE SIZING GUIDE

When it comes to choosing the right BMX there's loads of options to pick from, like colours and parts, but over everything you want to make sure that you've got the right sized bike for you, so we've created this quick guide to make it as easy as possible.


BMX Bikes are generally measured in 2 ways, the size of the wheel and the length of frame. 20" is the standard BMX wheel size but there are plenty of variations out there from 12" all the way up to 26"! The second measurement is the length of the frame, and this is worked out by measuring the length of the top tube. Frames tend to come in all manners of lengths and this is where you can really dial the feel of your bike in.


To keep things simple we offer 3 different wheel sized bikes (16", 18" and 20") and our range of 20" bikes are the only ones where you will find some more options on which top tube length to pick from. 


Check below for our guide on which bike is best suited to which age and height range, and please note that some of the sizes and ages will overlap, this is due to personal preference also being a big factor when choosing the right sized bike for you. We can recommend the size that we think will be correct, but only you can choose the perfect fit.



Wheel Size (in) TT Length (in) Rider Height (ft) Rider Height (cm) Rider Age
16" 16" 3' 0" - 3' 8" 91cm - 111cm 3-7 years
18" 18" 3' 6" - 5' 0" 106cm - 152cm 6-11 years
20" 18.5" - 20.5" 4' 2" - 5' 4" 127cm - 162cm 10+ years
20" 20.5" - 21" 5' 2" - 6' 4" 157cm - 193cm 11+


*TT = Top Tube
Now as mentioned all of the above sizing is approximate to what we recommend based on each size. You might prefer having a longer or smaller top tube than what is listed above based on your preferred style of riding, and that is perfectly fine, after all it is freestyle!

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