The 1999 Diamond Back Assault EX BMX features a lightweight 6061 alloy Franko-design frame, paired with a full chromoly fork using a 1-1/8” threadless steerer, 1-1/4” blades, and a chrome finish. It comes fitted with handlebars offering an 8” rise in chrome, held by an alloy A-head stem (1-1/8”). Braking is handled by a Tektro alloy linear-pull brake with matching lever, while the drivetrain uses a DB three-piece chromoly 175mm crank in chrome with a quick-change 44-tooth chainwheel, also in chrome, matched to alloy platform pedals with chromoly 9/16” axles. The wheelset consists of alloy double-wall 20x1.75” 36-hole rims, alloy hubs, and 14-gauge stainless spokes, wrapped in Comp III-style tyres (20x2.125” front, 20x1.75” rear). Comfort comes via a padded seat with alloy seatpost.
Alloy Franko Frame
3pc CR-MO Cranks
Alloy Rims
To use the BMX SerialFinder start typing the whole serial into the search bar at the top of the page, or use the Advanced Search page. Based on your entry, a filtered list of possible bikes that match your serial year and month will appear.
Diamond Back BMX serial numbers.
The first three characters ACK is the factory code.
After the above factory code, the next character is year of production. 8 = 1998, 9 = 1999. Production would have most likely started around May 1998 through to April 1999.
After the year is month of production. A = January, B = Febuary, C = March, D = April, E = May, F = June, G = July, H= August, I = September, J = October, K = November, L = December
Example: ACK8H00000
Made in Taiwan.
As a general rule, bikes made in Taiwan had around a 8 - 9 month production lead timeline before they were delivered and sold in bike shops around the world. Generally around May of each year, factories would switch production to making models for the following year.
