I researched it and came up with 2004. It's a Proline model, and the top tube measures 21.5 as standardly measured (XL).
The wheels are new and relatively true (+/- 1mm), with no brake rub when installed (I did ride this a bit). New laidback seat post (this is custom shimmed to fit, as Redline uses it's own custom size, and most other seat posts won't fit). New partially vintage pad set. The frame has several marks and minor crank knock on the left side.Crank knock is deep into the surface coating, but not into the tube. (really just a serious cosmetic issue). The decals are somewhat cracked and faded.
The headset and (sealed bearing) European Bottom Bracket were professionally gone over by a local bike shop. This bike has the original Redline Proline cranks with European sealed bearing bottom bracket.This bike is perfectly tuned and set up, and needs only the numbers on the plate! This bike is race or skatepark ready, and really is the best bike that I ever built! Weight as pictured 25 pounds. I don't care if I sell this, but if I do, I can build another one! The item "2004 REDLINE PROLINE XL (21-1/2) 20 BMX BIKE RED ANODIZED / BLACK" is in sale since Saturday, January 2, 2021. This item is in the category "Sporting Goods\Cycling\Vintage Cycling\Vintage Bicycles". The seller is "bakke_mark" and is located in Bettendorf, Iowa. This item can be shipped worldwide.