I wasn't able to find the exact numbers anywhere,just articles saying -- better, worse... which is totally useless so I did my own.
I will try to keep this short, I have 3 sheets full of calculations but this is to sum it up:
-If you ride slow around 15km/h a Tyre change from OK tyres to great tyres with low rolling resistance will give you huge gains alone,
-If you average speed is 25km/h+ a tyre change will still give a good effect, but the aero is HUGE ( You can Install TT bars on your mtb for like £15 and they will give you BETTER aero than being on drops on a Road bike + wear tighter fitting clothes + just look at your pose in mirror/reflection)
-Various ''must have'' bits/weight of the bike or the brand of the bike/your gear/bicycle type.. gives very very marginal gains, we are talking about max 1-3% gains,under 25km/h , about 5% if we are going at 35km/h+ speeds.
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Here are the numbers If we start with a mtb/hybrid with decent tyres and not very huge layers of clothes and change to better rolling tyres (£40-50/pair) and Install TT bars on your bike to get in good position + have a decent form and better fitting clothes
( based on a 80kg rider with a 14kg bike, they will change around 0.4-0.5% if you drop the weight of the bike by 4kg - so very marginal and not worth it)
___________
For the same W worth of effort:
Only with better tyres increase your speed from 15km/h to 17km/h /// 13% gain or from 60mins to 52mins to do the same distance.
Only with better tyres increase your speed from 25km/h to 26.5km/h /// 6% gain or from 60mins to 56.5mins to do the same distance.
With Better tyres+ TT bars+ good position From 15km/h to 19.3km/h /// 28% gain or from 60mins to 43mins to do the same distance.
With Better tyres+ TT bars+ good position From 25km/h to 30.3km/h /// 21% gain or from 60mins to 47.5min to do the same distance.
You can play around with some of the data here, https://www.gribble.org/cycling/power_v_speed.html however you will need to know the resistances on everything ( it's available if you search around).
I will try to keep this short, I have 3 sheets full of calculations but this is to sum it up:
-If you ride slow around 15km/h a Tyre change from OK tyres to great tyres with low rolling resistance will give you huge gains alone,
-If you average speed is 25km/h+ a tyre change will still give a good effect, but the aero is HUGE ( You can Install TT bars on your mtb for like £15 and they will give you BETTER aero than being on drops on a Road bike + wear tighter fitting clothes + just look at your pose in mirror/reflection)
-Various ''must have'' bits/weight of the bike or the brand of the bike/your gear/bicycle type.. gives very very marginal gains, we are talking about max 1-3% gains,under 25km/h , about 5% if we are going at 35km/h+ speeds.
_____________
Here are the numbers If we start with a mtb/hybrid with decent tyres and not very huge layers of clothes and change to better rolling tyres (£40-50/pair) and Install TT bars on your bike to get in good position + have a decent form and better fitting clothes
( based on a 80kg rider with a 14kg bike, they will change around 0.4-0.5% if you drop the weight of the bike by 4kg - so very marginal and not worth it)
___________
For the same W worth of effort:
Only with better tyres increase your speed from 15km/h to 17km/h /// 13% gain or from 60mins to 52mins to do the same distance.
Only with better tyres increase your speed from 25km/h to 26.5km/h /// 6% gain or from 60mins to 56.5mins to do the same distance.
With Better tyres+ TT bars+ good position From 15km/h to 19.3km/h /// 28% gain or from 60mins to 43mins to do the same distance.
With Better tyres+ TT bars+ good position From 25km/h to 30.3km/h /// 21% gain or from 60mins to 47.5min to do the same distance.
You can play around with some of the data here, https://www.gribble.org/cycling/power_v_speed.html however you will need to know the resistances on everything ( it's available if you search around).
