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FastFitness New Shop is Open 🏬
https://www.cyclingapps.net/shop/shop-front/
https://www.paypal.me/fastfitnesstips
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https://www.paypal.me/fastfitnesstips
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https://www.paypal.me/fastfitnesstips
https://www.paypal.me/fastfitnesstips
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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New! 50% off training plan (code="TIZ") based on your inputs: https://www.cyclingapps.net/coaching/order-personalized-adaptive-training-plan/
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 OLD / PREVIOUS STEM SETUP
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Old Stem Length (cm) that you removed11< 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)25< enter
Small drop...Looks ok
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Typical head/steerer tube angle75
Look this up or measure this angle (default 73.5 // see figure........)
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We calculate drop/rise from neutral as1,91cmSlight drop
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 NEW STEM SETUP
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New Stem Length (cm) that you fitted11< enterLooks ok
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New Stem Drop Angle (angle downward)25< enterLooks ok
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We calculate drop/rise from neutral as1,91cmSlight drop
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Old to New setup *additional* drop0,00A
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)1B
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)60< enter
This is typically 40% of your height or arm span
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(Optionally) Saddle height above bars (cm)0< 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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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 Total1,00A+B+C
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NEW CHANGE IN BAR WIDTH
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Reduced your bar width by (cm)4< enter
eg swapped 44cm for 38cm
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YOUR SPEED
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Typical Speed (kph)40,0< 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)22,2
fairly big gains, wow!
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 Approximate gains (seconds in 40km)79,7
Big time gains!
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 Approximate % time gain2,2
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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We invite you to Join:
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https://www.strava.com/clubs/fastfitnesstips
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Share this sheet:
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https://fft.tips/stem
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