Velopedia Bicycle Archive
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Compare published geometry, gearing and specifications for up to three bicycles.
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1 of 2 bicycles
At a glance
Key differences
Supported differences are shown below. Data limitations are labeled separately.
- Identity & price
These bicycles are categorized differently: 2008 Eastern Bikes Thunderbird is BMX; 2012 Eastern Bikes Thunderbird is Mountain.
- Data limitation
No geometry is recorded for 2008 Eastern Bikes Thunderbird and 2012 Eastern Bikes Thunderbird.
- Data limitation
Only 2008 Eastern Bikes Thunderbird has enough published drivetrain data for gearing calculations.
Gearing comparison
Lower gears help on climbs. Higher gears suit higher speeds.
RPM
RPM = pedal turns per minute.
Ratio2.08:1
Estimated speed at 90 RPMGear
Rear tire: 26×2.1.
Gearing unavailable for this size.
How it works
Ratio = front teeth ÷ rear teeth. Hub gears also include the hub’s internal ratio. A 400% range means the highest ratio is four times the lowest.
Speeds are estimates from tire size and pedal cadence. Actual speeds vary.
Complete specification tableShows different published values and gaps where a bicycle lacks data. Different wording reflects source language, not necessarily different components. Swipe for more columns.
Specification
2008 Eastern Bikes Thunderbird
2012 Eastern Bikes Thunderbird
Overview
Model Year
2008
2012
Brand
Eastern Bikes
Eastern Bikes
Model
Thunderbird
Thunderbird
Bicycle Type
BMX
Mountain
Original MSRP
$699.99
Not documented
Colors
Blue, Black
Graphite/Gold, Graphite/Light Green
Sizes
21.5" TT
22.5"TT
Weight
—
—
Frameset
Frame Construction
TIG-welded
—
Frame Material
Chromoly
Full 4130 Chromoly Frame
Fork
RST Space Free, 80mm travel
Marzocchi DJ 3 80mm
Fork Material
Magnesium/cr-mo, single crown
—
Drivetrain
Component Group
Mountain Mix
—
Crankset
Eastern 3pc Raptor, Eastern Medusa Lite 25t teeth
Eastern Shaft 175mm 3pc
Bottom Bracket
Spanish
Spanish Sealed
Cassette
Cassette driver
12t Driver
Rear Cogs
1-speed, 12 teeth
—
Chain
KMC 510HX
HalfLink Chain
Pedals
Wellgo 313
Eastern Crown Pedals
Brakes
Brakes
Tektro Aquila mechanical disc rear brakes, Tektro ML-570 rear levers
Tektro Mechanical Disc
Cockpit & Contact Points
Headset
1 1/8" internal
Integrated 1-1/8" threadless
Handlebar
Eastern Steel 2.0t
Eastern Night Train alloy 3"
Handlebar Extensions
Not included
—
Stem
Eastern Choker
Forged Alloy Front Load
Saddle
Eastern Pinner
Eastern Logo
Seatpost
Straight post
1-Piece Alloy Post Combo
Wheels & Tires
Hubs
Front: Eastern sealed 20mm disc, Rear: Eastern LB9
Alloy 36h Eastern Single Speed
Rims
Front: Wienmann HL32, Rear: Kinlin BM25, 32-hole
—
Spokes
Stainless steel, 14ga. (2.0mm) straight gauge
—
Spoke Nipples
Brass
—
Front Tire
26 x 2.35" Kenda Small Block Eight
Kenda K-Rad 26 X 2.3"
Rear Tire
26 x 2.10" Kenda NPJ 1052
—
Wheel Size
26" wheels
—
Historical specifications are presented as an archival reference. Components may have varied by market, size, or production run.