FFT helps you find optimal tyre by surface conditions 🏞 [quick link fft.tips/surface]

	B	C	D	E	G	H	K
1		New FastFitness Shop is Now Open 🏬	https://www.cyclingapps.net/shop/shop-front/
2							VALIDATION
3	Find Optimal Tyre Size for any Surface						rim
4							15
5		>> helps you work out the best tyre for each riding surface by rolling resistance (as well as weight / rim size) <<					15.5
6							16
7							16.5
8							17
9		Your weight (with bike & equipment)	120	kg			17.5
10							18
11		Do you have preferred Tyre Width?	32	mm			18.5
12							19
13		Internal Rim Bead Width/Size (default is 22c)	21	mm (c)			19.5
14			20				20
15		External Rim Width (leave BLANK if Unknown)		mm (c)			20.5
16		if you don't know your wheel width then our guess is >>	25.9	mm			21
17		closest tyre that will "blow up" to match this rim is about >>	21.3	mm			21.5
18		perhaps corresponding to the following	Kenda Kountach 25C	<< experimental			22
20							23
21							23.5
22		Enter Surface Conditions (% or ratio or distance)	Distance on 0 to 100 scale	Severity			24
23							24.5
24							25
25		Amount of Gravel/Off Road.....	0	mild			25.5
26			0% CRR= 0.0181				26
27							26.5
28		Amount of Cobbles.....	0	mild			27
29			0% CRR= 0.0181				27.5
30							28
31		Rough tarmac.....	40				28.5
32			40% CRR= 0.0064				29
33							29.5
34		Normal / typical tarmac.....	50				30
35			50% CRR= 0.0056				30.5
36							31
37		Super smooth tarmac.....	10				31.5
38			10% CRR= 0.005				32
39							32.5
40		Your overall surface is described as…………..	All Tamac				33
41			ave CRR = 0.00586				33.5
42							34
43							34.5
44		For this surface, your rim & your weight recommend tyre is	28.6	mm			35
45		At this size (28.6mm) ...then pressure should be about	118.4	psi			35.5
46		At this size & pressure ...then contact patch will be about	370.7	mm2			36
47		At this pressure, we estimate your tyre will actually measure...	30.7	mm			36.5
48							37
49	vs your choice...						37.5
50		but you self-selected a tyre size of 32mm	32	mm			38
51		At this size (32mm) ...then pressure should be about	110.4	psi			38.5
52		At this size & pressure ...then contact patch will be about	424.1	mm2			39
53		At this pressure, we estimate your tyre will actually measure...	34.5	mm			39.5
54							40
55
56						alternative calc:
57					https://fft.tips/pressure
58
59
60
61
62
63
64		Share this sheet:
65
66		https://fft.tips/surface
67
68		Related Sheets
69
70		https://fft.tips/pressure2
71
72		https://fft.tips/tyre2
73