FFT Saddle Angle Stem SlamDrop Aero Calculator
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https://youtu.be/SRnX1k0VMLM
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...takes about 10 seconds to make calculation..... If useful be super nice & donate
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https://youtu.be/SRnX1k0VMLM
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FFT Hip Angle+Stem Slam Aero Calculator
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https://youtu.be/SRnX1k0VMLM
https://youtu.be/SRnX1k0VMLM
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https://youtu.be/SRnX1k0VMLM
https://youtu.be/SRnX1k0VMLM
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instructions: compare your current (old) setup to a new setup based on stem length/drop & spacer height
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to find the likely watts or time savings (new vs old). To flip your stem (enter eg -9 in d12 to +9 in d22) keep spacers at "0"
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OLD / PREVIOUS STEM SETUP
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Old Stem Length (cm) that you removed14< enter
Typical stems are 6,9,10,11,12 cm (measure headset to bar center)
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Old Stem Drop Angle (angle downward)12< enter
Small drop...Looks ok
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Typical head/steerer tube angle73.5
Look this up or measure this angle (default 73.5 // see figure........)
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We calculate drop/rise from neutral as-1.34cm
Slight rise.....dont worry its common
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NEW STEM SETUP
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New Stem Length (cm) that you fitted14< enterLooks ok
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New Stem Drop Angle (angle downward)17< enterLooks ok
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We calculate drop/rise from neutral as-0.12cmSlight rise
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Old to New setup *additional* drop1.22A
This is the vertical drop (or rise if neg) from the previous position (above)
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SLAM STEM >> SPACERS
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Amount of spacer height removed (cm)5B
You removed this much height in cm
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CHANGE IN TORSO / HIP / SADDLE ANGLE
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Distance mid-saddle to bars (cm)55< enter
This is typically 40% of your height or arm span
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(Optionally) Saddle height above bars (cm)
8.89< enter
This only makes a tiny difference to this calculation
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Change in torso angle (degrees downward)
0< enter
No change in rotation
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9.30188939
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We calculate an additional drop of 0.00C
Vertical drop from the previous position (above) with the spacer drop included
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Grand Total6.22
A+B+C
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NEW CHANGE IN BAR WIDTH
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Reduced your bar width by (cm)2< enter
eg....swapped 44cm for 40cm
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40
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YOUR SPEED
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Typical Speed (kph)40< enter
Your average riding speed (kph)
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24.85mph
[Tip try several speeds eg hilly course vs flat course]
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RESULTS WATT SAVINGS
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** Approximate gains (drag in watts)20.8
fairly big gains, wow!
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Approximate gains (seconds in 40km)74.7
Big time gains!
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Approximate % time gain2.1
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**add 25% to this figure if you ride a flat bar MTB/Hybrid bike
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If you do not want this, either unsubscribe to this sheet after using it; or use an annoymous email
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169.5
Prediction Lower 60m
multiplier#3
#DIV/0!
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191.7
Difference
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https://fft.tips/stem
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Related App version
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135.5
Prediction Lower
multiplier#3
0
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