Velopedia Bicycle Archive
2006 Diamondback Reactor Jr.
BMX bicycle from the Velopedia specification archive.
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- Original MSRP
- $340.00
- Colors
- Silver
- Geometry
- Legacy reference · Ride analysis
- Archive ID
- 94253
Current market
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Velopedia analysis
What the specifications mean
With rim brakes, the wheel’s braking surface is part of the system, so rim wear matters alongside pads and cables. On the alloy frame, dents and hairline cracks around welds matter more than cosmetic scratches. Pay closest attention near the head tube, bottom bracket shell, dropouts and other heavily loaded junctions. The archive lists an original MSRP of $340.00. That is launch-price context, not a statement about the bike’s present condition or current market value.
Brake service
Rim braking
Pad compound, cable condition and wheel braking-surface wear belong in the inspection.
Frame material
Aluminum / alloy
Dents and cracking around welds at the head tube, bottom bracket shell and dropouts deserve attention.
Original MSRP
$340.00
Historical launch-position context—not a current valuation or asking price.
Understand MSRP and market evidence →
Used-bike inspection
If you’re buying this bike used
Before any test ride: both brakes should stop the bike firmly and release cleanly; both wheels should run true and be securely attached; tires should have no casing damage; and the headset, handlebar, stem, cranks and pedals should have no looseness or play.
Follow the full used-bike inspection order →- FrameLook closely for dents and hairline cracks around welds, the head tube and bottom-bracket area. Cosmetic scratches matter less than a change in shape or a crack line.Inspect the frame and fork →
- BrakesInspect pad condition, cable movement and the rim sidewalls or brake tracks for wear. A concave or heavily worn braking surface can mean the wheel also needs replacement.Inspect the brakes →
- DrivetrainShift through the full range under light load, measure chain wear and inspect the cassette or freewheel teeth. Skipping or hesitation can indicate wear, poor adjustment or mismatched parts.Check drivetrain wear →
- Wheels & tiresSpin both wheels and watch the rims for side-to-side or vertical movement. Check for dents, cracks, loose or uneven spokes and hub play, then inspect both tire casings for cuts, cracking or exposed threads.Check wheels and tires →
Bike-specific inspection checklist 18 checks based on 5 archived component groups Open checklistClose checklist
This checklist uses the archived equipment for this bike. It cannot confirm the condition, service history or later component changes of the example in front of you.
Identity and fit
Follow the full used-bike inspection order →Archived: 2006 Diamondback Reactor Jr. · BMX
Frame and fork
Inspect the frame and fork →Archived: Frame: TIG-welded · Fork: DB Reactor Jr. · Chromoly, unicrown crown
Drivetrain
Check drivetrain wear →Archived: Crankset: Truvativ Racing Jr., 40 teeth · Bottom bracket: Truvativ Power Spline · Rear cogs: 1-speed, 15 teeth · Chain: KMC HP20, 1/2 x 1/8"
Brakes
Inspect the brakes →Archived: Brakes: Tektro mini linear pull rear brakes, Tektro 2-finger rear levers
Wheels and tires
Check wheels and tires →Archived: Wheel size: 20" wheels · Rims: Front: Alex R390, Rear: Alex R-390, 24-hole · Hubs: Aluminum, sealed bearing · Front tire: 20 x 1 3/8" Tioga Comp III
Controls and contact points
Archived: Headset: 1" threadless FSA · Handlebar: DB Junior alloy · Stem: Jr. alloy · Seatpost: Uni, 22.2mm (7/8 inch) diameter · Saddle: Uni · Pedals: DB Junior alloy
Before and during the test ride
Follow the full used-bike inspection order →Interpretation based on the archived manufacturer specifications. Confirm exact fit and standards before ordering parts or performing service.
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Frameset
| Frame Construction | TIG-welded |
|---|---|
| Frame Material | 6061 T6 aluminum |
| Fork | DB Reactor Jr. |
| Fork Material | Chromoly, unicrown crown |
Drivetrain
| Component Group | N/A |
|---|---|
| Shifters | N/A |
| Front Derailleur | N/A |
| Rear Derailleur | N/A |
| Crankset | Truvativ Racing Jr., 40 teeth |
| Bottom Bracket | Truvativ Power Spline |
| Rear Cogs | 1-speed, 15 teeth |
| Chain | KMC HP20, 1/2 x 1/8" |
| Pedals | DB Junior alloy |
Brakes
| Brakes | Tektro mini linear pull rear brakes, Tektro 2-finger rear levers |
|---|
Cockpit & Contact Points
| Headset | 1" threadless FSA |
|---|---|
| Handlebar | DB Junior alloy |
| Handlebar Extensions | N/A |
| Stem | Jr. alloy |
| Saddle | Uni |
| Seatpost | Uni, 22.2mm (7/8 inch) diameter |
Wheels & Tires
| Hubs | Aluminum, sealed bearing |
|---|---|
| Rims | Front: Alex R390, Rear: Alex R-390, 24-hole |
| Spokes | 14ga. (2.0mm) straight gauge |
| Spoke Nipples | Brass nipples |
| Front Tire | 20 x 1 3/8" Tioga Comp III |
| Wheel Size | 20" wheels |
Historical reference geometry
Geometry
Historical model-level geometry recovered from Velopedia’s original archive database. The source does not identify which listed frame size this reference describes, so fit interpretation is intentionally limited and no size-normalized Archive Context is generated.
| Measurement | Legacy reference |
|---|---|
| Top tube | 473.7 mm |
| Head-tube angle | 73° |
| Seat-tube angle | 70° |
| Chainstay / rear center | 368.3 mm |
Geometry source: Historical archive database — model-level reference geometry. The historical source provides one model-level geometry set and does not identify the corresponding frame size.
Geometry interpretation
What this geometry means
Legacy reference geometry
Fit reference
The historical source lists a 473.7 mm top-tube length, but it does not identify which frame size this model-level reference describes or whether the historical field was measured horizontally. Treat it as an archival frame reference rather than a size-specific fit recommendation. Its 70° seat-tube angle describes the reference frame’s seat-line orientation. Actual seated position still depends on frame size, saddle height and fore-aft adjustment.
Handling tendencies
The 73° head angle points to moderate steering geometry. Wheel size, fork offset, trail and the unknown reference frame size still matter to the final steering feel. The 368.3 mm chainstay records the rear-center dimension of the historical reference. Rear-center length influences weight distribution and how readily the rear of the bike changes direction.
This is historical model-level reference geometry, not a known frame-size geometry table or a ride test. Frame size, rider proportions, cockpit setup, tires, suspension and components can materially change fit and handling.
Specifications are presented as a reference. Components may vary by market, size, production run, or later manufacturer revisions.