Part of the scene
Rider owned, independent and rooted in Sheffield BMX.
About Waller BMX
Fly Bikes Sierra 18" Complete BMX Bike 2024
£789.99
Dispatch & delivery
Checking dispatch time…
Then add UK courier delivery:
Standard tracked: 2–4 working days after dispatch
FedEx Express: 1–2 working days after dispatch
Express delivery does not shorten this wait.
Currently out of stock Use “Notify me when available” below to be notified when this item is back in stock.
Fly Bikes Sierra 18" Complete BMX Bike 2024
The Sierra bike is designed to be our best 18" bike. From a replication of the Sergio Layos signature frame just adapted to fit perfectly on 7 to 12 year old riders with the full range of supported bike parts to get a complete top-range 18’’ machine straight out of the box.
Geometry:
TOP TUBE LENGTH
18.7”
CHAINSTAYS LENGTH
12.2”
HEAD TUBE ANGLE
75º
SEAT TUBE ANGLE
71º
BB HEIGHT
10.5”
STAND OVER HEIGHT
8”
FORK OFFSET
25mm.
BAR RISE
8”
BAR WIDTH
26”
BAR BACKSWEEP
10º
BAR UPSWEEP
2º
_
Specifications:
Frame
Sierra / Full 4130 CrMo / Heat treated HS, BB / Invest Casting Heat Treated Dropouts / EBS brake system
Fork
Volcano 18" / Full 4130 CrMo / 1 Piece Steerer Tube CNC / Heat Treated dropouts
Bars
Sierra 8" / Full 4130 CrMo
Grips
Flybikes Ruben II Mini / 130mm Long
Stem
Fly Volcano S 25mm Rise / 45mm Reach / CNC Machined / 6061-T6 Aluminum
Headset
Volcano 15 / Sealed Bearing / CNC Machined / 6061-T6 Aluminum
Lever
None
Brake
None
Cranks
Dolmen 155mm
Bottom Bracket
Spanish / Sealed Bearing
Sprocket
Tractor / CNC Machined / 6061-T6 Aluminum / 25T
Pedals
Flybikes Ruben Graphite / Nylon - Fiberglass Compound
Chain
Tractor / 4130 CrMo Heat Treated / Hollow Pins Chromium Treatment / 64 Links
Rims
Trebol / Semi double wall / 6061-T6 Aluminum / 36H
Front Hub
Trebol Male Axle / Sealed Bearing / 3/8” mm. / 36H
Rear Hub
Trebol Cassette 14mm. Male Axle / Sealed Bearing / 36H / 9t.
Tires
Flybikes Fuego 18" x 2.2 Front & Rear / 60 TPI / 65 PSI
Seat
Flybikes Aire Tripod / 100% Synthetic Leather / 7 mm Thickness
Post
Fly Tripod / CNC Machined / 6061-T6 Aluminum / 135 mm Long
Weight
8.9kg. / 19.6 Lb.
Need help choosing a BMX bike or finding the right BMX parts? You’re in the right place.
Visit our Waller BMX Guide for helpful advice on bikes, parts, sizing and compatibility. If you’re still unsure, call or email Waller BMX, or click the chat icon to speak to our knowledgeable BMX team.
Check the dispatch box for your selected colour, size and quantity. Here’s what the availability information means.
In stock at Waller BMX
Held by us and ready to dispatch within 1 working day.
In stock at a supplier
Available from our supplier’s warehouse. Allow the dispatch time shown in the box before your order leaves. Supplier processing times can occasionally vary.
Pre-orders
These items are not currently in stock. Check the estimated date shown on the product page. If no current estimate is available, contact us before ordering.
Sold out
If ordering is unavailable, use Notify me when back in stock to hear when the selected variant is available again.
Dispatch time + courier delivery time
Courier delivery starts after dispatch. Express delivery does not shorten a supplier or pre-order wait.
Ordering several items? We send everything together once all items are ready. Your cart shows the longest dispatch wait needed for your order.
Need an estimate or help finding an alternative? Ask our BMX team →
- Spend over £75 and get Free Tracked UK Delivery
- Spend over £249.99 for Free Next Day UK Delivery*
*Excludes larger bikes and certain postcodes.
Visit our Shipping and Returns page for more information.
For more information on larger bike shipments click here.
For more information about lost or damaged parcels click here.
For more information about Customs and Duties see our FAQ.
We now have an Estimated Import Costs calculator on our product and cart pages to help you estimate duties. Please be aware unless stated we ship all International Orders using the option DDU (Delivered Duties Unpaid).
For extra information about ordering to outside the UK see here.
Save up to 42% on a new complete bike or parts! We accept major UK Cycle to Work vouchers, including Green Commute Initiative, Cyclescheme, and more.
How to order:
1. Select your bike or build.
2. Get a voucher/certificate from your employer or scheme provider.
3. Contact us or select Cycle to Work at checkout to complete your purchase.
Got questions about using your voucher? Drop us an email or message our live chat!
WALLER BMX · SHEFFIELD · EST. 2012
SHEFFIELD'S FIRST RIDER-OWNED BMX STORE.
Born in Sheffield in 2012. Built around riders, sessions and people who make BMX what it is.
We're here to help you find the right products for the way you ride.
5-star Google reviews · Read reviews →Need a hand?
Ask a rider about sizing, fit or compatibility.
Chat on WhatsAppDelivery & returns
Find shipping details and return terms in one place.
View the detailsFound it cheaper?
Ask us about a price match before you buy.
See price-match terms
Get to know your setup.
Clear guides to BMX bikes, sizing and parts.
Explore the Waller BMX Guide