Velopedia Bicycle Archive

Compare Bicycles

Compare published geometry, gearing and specifications for up to three bicycles.

1 of 2 bicycles

At a glance

Key differences

Supported differences are shown below. Data limitations are labeled separately.

  1. Identity & price

    These bicycles are categorized differently: 2011 GT Tachyon 4.0 is Road; 2012 GT Tachyon 4.0 is Hybrid.

  2. Data limitation

    No geometry is recorded for 2011 GT Tachyon 4.0 and 2012 GT Tachyon 4.0.

Gearing comparison

Lower gears help on climbs. Higher gears suit higher speeds.

RPM

RPM = pedal turns per minute.

2011 GT Tachyon 4.048/38/28T · 11–32T · 8-speed
Lowest0.88:1Highest4.36:1Total range499%
Estimated speed at 90 RPMLowest gear6.3 mphHighest gear31.6 mph

Uses front tire 700C×32; rear size isn’t listed.

2012 GT Tachyon 4.048/38/28T · 11–32T · 8-speed
Lowest0.88:1Highest4.36:1Total range499%

Speed unavailable: wheel or tire size is missing or unclear.

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.

Try other gearing

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.
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Specification
2011 GT Tachyon 4.0
2012 GT Tachyon 4.0
Overview
Model Year
2011
2012
Brand
GT
GT
Model
Tachyon 4.0
Tachyon 4.0
Bicycle Type
Road race & triathlon
Hybrid/Comfort
Colors
White
Satin Black, Silver
Sizes
XS, S, M, L, XL
S, M, L, XL
Weight
—
—
Frameset
Frame Construction
Aluminum
—
Frame Material
Aluminum
Hydroformed Butted 6061 Al
Fork
GT Type R Alloy
GT Type R w/ 6061
Fork Material
Alloy
—
Drivetrain
Component Group
Road Mix
—
Shifters
Shimano EF-51
Shimano EF-51 8spd
Front Derailleur
Shimano M191
Shimano M191
Rear Derailleur
Shimano Acera
Shimano Acera 8spd
Crankset
Shimano FC-M311, 48/38/28t teeth
Shimano M311 48/38/28t
Bottom Bracket
Cartridge Sealed
FSA Sealed
Cassette
Shimano HG50
Shimano HG-51 8spd 11-32t
Rear Cogs
8-speed, 11 - 32 teeth
—
Chain
KMC HG39
KMC HG-40
Pedals
Alloy body / steel cage
GT Trekking
Brakes
Brakes
Tektro RX-1 brakes, Shimano EF-51 levers
Tektro RX 1.0
Cockpit & Contact Points
Headset
Integrated Sealed
Fsa
Handlebar
GT flat bar
GT Type R Flat-Riser
Handlebar Extensions
Not included
—
Stem
GT alloy
GT 3D Forged 6061
Saddle
GT sport
GTw Bio-Morphic
Seatpost
GT Design Alloy
GT 2 bolt Alloy Road
Wheels & Tires
Hubs
Formula alloy
Formula Sealed Formula Sealed
Rims
Jalco DRX3000, 32-hole
—
Spokes
Stainless, 14ga. (2.0mm)
—
Spoke Nipples
Brass
—
Front Tire
700 x 32c Kenda Kwest
Kenda Kwest 700x32
Wheel Size
700c wheels
—

Historical specifications are presented as an archival reference. Components may have varied by market, size, or production run.

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