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Drivetrain Losses Dynamic Calculator
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>> helps you find the lowest friction optimized drivetrain and gear choice <<
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DATA ENTRY
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a
Enter your current gear selection
Optional
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28inch
635
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Current cassette ring/cog 12
Enter Current Cog not total capacity
Wheel Size 700c/29er622mm
27inch
630
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700c/29er
622
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Enter current chainring (teeth)53
Chainring value looks ok
Tyre Size (in mm)25672mm
650b/27.5
584
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if inner ring is less than this value chain-clipping may occur (cost 8+watts)
672
650c
571
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b
Enter your gearing type
2111.2mm
26inch mtb
559
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eg 1x 11 2x11Gear Ratio 2095 mm
24inch S5
547
16
82 inches
24inch E6
540
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Cassette size (eg 11 speed) 11 StandardSize
24inch Terry
520
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Number of chainrings2 Standard Size
24inch MTB/BMX
507
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20inch Recumbent
451
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c
Enter your rear derailleur pulley size
20inch Schwinn
419
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20inch BMX/Recumb
406
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Top Pulley Size (teeth) => 14 Large
16inch Brompton
349
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Bottom Pulley Size (teeth) => 19 Large
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BEARINGS AND CHAIN CONDITION
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d
Enter your Bearing Quality (range 1-10)
1 - 10 scale (see tab 2)
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1 = Best Ceramic | 2 = Best Quality Steel | 3 = Quality Aftermarket | 4 = Decent or Top groupset | | 5 = Fair quality (eg cheap groupset)
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6 = Low quality (or dirty or worn) | 7 = Low quality & dirty & worn | 8 = slightly rusty | 9 = horribly worn | 10 = almost seized |
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Bottom bracket (use code) => 1Best Ceramic
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Pedal bearings (use code) => 4
Decent or Top groupset (eg 105, dura-ace, Sram Red) |
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Jockey wheels (use code) => 1Best Ceramic
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About Your Chain [see tab 3]
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f
Confess your chain condition
21 - 12 scale (see tab 3)
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1= ultrasonic clean + wax immersion | 2 = degreased & waxed drip | 3 = as new + lube | 4 = good condition
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5 = good but fairly dirty & gritty | 7 = dirty & a bit worn | 8 = worn & a bit rusty | 10 = fairly worn & rusty | 12 = very rusty
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ADVANCED DATA ENTRY
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g
Enter usual RPM
75 Cadance value looks ok
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h
Enter usual Watts when riding
280 Watt value looks ok
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RESULTS
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Watts of friction for RearDeraill & Chainset
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Articulation1.25
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Total1.25watts
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16.0%of drivetrain losses
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Watts of Chain & Cassette Friction
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Chain Articulation5.76 chain losses
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Cross-chaining0.11
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Total5.87watts
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75.3%of drivetrain losses
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Watts for Bearings
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Bottom bracket x 20.31
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Pedals x 20.31
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Rear Derallieur Jockey x 20.06
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0.67watts
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8.7%of drivetrain losses
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GRAND TOTAL DRIVETRAIN LOSSES
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your drivetrain losses
average drivetrain
best possible drivetrain
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7.79 watts VS15.80 VS5.80
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bearing all = 4bearing all = 1
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equivalent to speed difference (vs average drivetrain)
0.51kph
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equivalent to secs over 40km (vs average drivetrain)
-47.7
secs over a distance of
40.0km
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