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FastFitness New Shop is Open 🏬
https://www.cyclingapps.net/shop/shop-front/
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https://www.paypal.me/fastfitnesstips
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https://www.paypal.me/fastfitnesstips
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FFT Stem Slam Aero Calculator
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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OLD / PREVIOUS STEM SETUP
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Old Stem Length (cm) that you removed10< 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)6< enter
Small drop...Looks ok
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Look this up or measure this angle (default 73.5 // see figure........)
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We calculate drop/rise from neutral as-9,95cm
Big upwards rise
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NEW STEM SETUP
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New Stem Length (cm) that you fitted13< enterLooks ok
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New Stem Drop Angle (angle downward)12< enterLooks ok
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We calculate drop/rise from neutral as-12,72cm
Big upwards rise
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Old to New setup *additional* drop-2,77A
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)4B
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)72< enter
This is typically 40% of your height or arm span
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(Optionally) Saddle height above bars (cm)20< 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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16,12762021
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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 Total1,23A+B+C
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NEW CHANGE IN BAR WIDTH
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Reduced your bar width by (cm)6< enter
eg swapped 44cm for 36cm
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Typical Speed (kph)35,0< enter
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21,75mph
[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)24,7
fairly big gains, wow!
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Approximate gains (seconds in 40km)128,2
Big time gains!
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Approximate % time gain3,1
allow 10 seconds to calc
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**add 25% to this figure if you ride a flat bar MTB/Hybrid bike
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