BSD ALVX AF + Frame
Regular price
$726.00
BSD ALVX AF + Frame
The latest version of Alex Donnachie’s signature BSD frame, the ALVX AF+. Steep head tube, short back end and equipped to handle the largest of tyres. This frame is clearly a tech street machine designed to respond quick. However, the 8.7 standover balances things out to keep the short and steep features looking and feeling like a bicycle and not a scooter.
“So, for the updated ALVX frame, the ALVX AF, we kept all sizes the same. I love the way the frame feels so didn’t want to change the sizes or geometry. We have redesigned the yoke to give it a much cleaner finish with an engraved BSD logo. Also, chose some fresh summer vibes for the colors” - Alex Donnachie Read more
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The ALVX AF is the latest incarnation of the ALVX frame, this version features a super tech invest cast chainstay yoke which gives even more tyre clearance as well as stiffening up the rear triangle. Your wheel can be slammed at an extremely short 12.5" CS length with no worries of your tyre rubbing!!
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Product Specs
- MATERIAL: Chromoly
- HEAD TUBE ANGLE: 75.5°
- SEAT TUBE ANGLE: 71°
- CHAIN STAY LENGTH: 12.5"
- BB HEIGHT: 11.7"
- WHEEL SIZE: 20"
- STANDOVER HEIGHT: 8.7"
- DROPOUT SIZE: 14mm
- HEADSET TYPE: Intergrated
- BB TYPE: Mid
- BRAKE MOUNTS: Brakeless
- GYRO TABS: None
- WEIGHT: 5lbs
Product Highlights
- Responsive Geometry with Short Backend and Steep Headtube
- Best suited to Street and Park riding
- High-quality Chromoly construction
- Brakeless Frame
- Integrated seat post clamp
INVEST CAST YOKE
At 12.5" the ALVX chainstay length is as short as it can be. By using invest casting we were able to create a new chainstay yoke which creates more clearance for the tire for when your wheel is slammed. Also because this part is cast and heat treated it strengthens the rear end of the frame by creating a more rigid junction.
INVEST CAST DROPOUTS
The dropout is cast as one piece, much stronger than a plate welded to a tube. 7mm thick to provide good support for your axle, and the small shape has been designed for grinding meaning there's no overhang to catch on ledges or rails, also the dropout is heat treated before welding making it extra tough. And finally there are integrated chain tensioner bolts inside.
EXTERNAL GUSSETS
On a frame the highest concentration of stress is at the junctions between the headtube/toptube and headtube/downtube. To handle the pressures of modern riding, the required strength is achieved using a combination of butted tubing and external gussets.
The latest version of Alex Donnachie’s signature BSD frame, the ALVX AF+. Steep head tube, short back end and equipped to handle the largest of tyres. This frame is clearly a tech street machine designed to respond quick. However, the 8.7 standover balances things out to keep the short and steep features looking and feeling like a bicycle and not a scooter.
“So, for the updated ALVX frame, the ALVX AF, we kept all sizes the same. I love the way the frame feels so didn’t want to change the sizes or geometry. We have redesigned the yoke to give it a much cleaner finish with an engraved BSD logo. Also, chose some fresh summer vibes for the colors” - Alex Donnachie
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 |
|---|---|---|
| 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!
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 high speed!
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.
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.
Stand over 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.
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