The 1998 Diamond Back Viper BMX features a chromoly main frame with oversized tubing, TIG welding, and double-thick dropouts for added strength, paired with a hi-ten fork using 1-1/4” blades. It comes fitted with handlebars offering an 8-1/2” rise in chrome, held by an alloy four-bolt stem. Braking is handled by Pro-Max alloy linear-pull brakes with matching lever, while the drivetrain uses a DB 175mm crank in chrome with a DB quick-change 44-tooth chainwheel, also in chrome, matched to DB resin pedals with 1/2” axles. The wheelset consists of alloy 20x1.75” 36-hole rims, alloy hubs, and 14-gauge spokes, wrapped in Comp III-style tyres (20x2.125” front, 20x1.75” rear). Comfort comes via a DB padded seat with a chrome steel 25.4mm seatpost. Finish options were full chrome, or flat grey, blue, or orange — each paired with a chrome fork.
Main Frame
1pc 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 ACS is the factory code.
After the above factory code, the next character is year of production. 7 = 1997, 8 = 1998. Production would have most likely started around May 1997 through to April 1998.
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: ACS7F00000
Made in Taiwan.
As a general rule, bikes made in Taiwan had around a 8 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.
