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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 28
Enter Current Cog not total capacity
Wheel Size 650b/27.5584mm
27inch
630
11
700c/29er
622
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Enter current chainring (teeth)52
Chainring value looks ok
Tyre Size (in mm)42668mm
650b/27.5
584
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if inner ring is less than this value chain-clipping may occur (cost 8+watts)
668
650c
571
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b
Enter your gearing type
2098.6mm
26inch mtb
559
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eg 1x 11 2x12Gear Ratio 2043 mm
24inch S5
547
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80 inches
24inch E6
540
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Cassette size (eg 11 speed) 12 Eagle? Campag 2018?
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) => 11 Standard Size
16inch Brompton
349
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Bottom Pulley Size (teeth) => 11 Standard Size
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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) => 4
Decent or Top groupset (eg 105, dura-ace, Sram Red) |
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About Your Chain [see tab 3]
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f
Confess your chain condition
11 - 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
95 Cadance value looks ok
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h
Enter usual Watts when riding
320 Watt value looks ok
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RESULTS
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Watts of friction for RearDeraill & Chainset
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Articulation2.60
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Total2.60watts
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29.7%of drivetrain losses
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Watts of Chain & Cassette Friction
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Chain Articulation4.54 chain losses
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Cross-chaining0.07
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Total4.61watts
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52.7%of drivetrain losses
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Watts for Bearings
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Bottom bracket x 20.37
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Pedals x 20.37
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Rear Derallieur Jockey x 20.80
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1.54watts
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17.6%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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8.74 watts VS19.01 VS7.74
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bearing all = 4bearing all = 1
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equivalent to speed difference (vs average drivetrain)
0.61kph
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equivalent to secs over 40km (vs average drivetrain)
-50.6
secs over a distance of
40.0km
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