Strength of the Ottoman Sipakhi cavalry in 1709 by A.Hill

Turkish Sipakhi's cavalrymen around 1707-08
Engraving by Gerard Scotin (source) 

British traveler Aaron Hill stated that there were 2 504 Zaims & 51 579 Timars in 21 provinces by 1709. The average number of Jabelu’s armed men per Timar was 3, per Zaim – 10. So, it gives about 180 000 of Sipakhi (Timariot) mounted troops. See also Marsiglie's data of around 1680 (link)  

	Province	Zaim	Timar
1	Anatolia	629	8570
2	Caraman	73	2165
3	Diarbekir	118	873
4	Scham	128	560
5	Sivas	108	3029
6	Erzurum	122	5548
7	Pascha	185	826
8	Marasch	27	512
9	Cyprus	40	1067
10	Tripoly	63	570
11	Rika	60	666
12	Terbozan	56	398
13	Halep	117	1044
14	Childir	106	959
15	Kupudan	124	1152
16	Rumelia	75	8194
17	Bosnia	63	1621
18	Kars	78	2111
19	Mosul	58	1340
20	Kibros	94	2450
21	Babylon	180	7924
	TOTAL	2504	51579

Source: Hill A. A Full and Just Account of the Present State of the Ottoman Empire. London, 1709. P. 25.