Maxxis tyres can be diff widths with the same description on the sidewall.
See below.. This is straight off Maxxis' website and can be found here.
http://www.maxxis.com/Bicycle/Mountain/Minion-DHF.aspx
ETRTO is the sizing you want to look at, not the width in inches....
notice the size, 26 x 2.3 (58-559) foldable bead, is wider than the 26 x 2.35(52-559) wire bead !:loco:
Size (ETRTO) TPI Bead Weight (g) Compound Max Psi Bike Tech
26X2.30 ( 58-559 ) Black 60 FOLDABLE 845 DUAL 60 EXO/TR
26X2.30 ( 58-559 ) Black 60 FOLDABLE 845 3C MAXX TERRA 60 3C/EXO/TR
26X2.35 ( 52-559 ) Black 60 WIRE 825 SUPER TACKY 65 ST
26X2.35 ( 52-559 ) Black 60 WIRE 785 SINGLE 65
26X2.35 ( 52-559 ) Black 60 FOLDABLE 700 SINGLE 65
26X2.50 ( 55-559 ) Black 60 FOLDABLE 835 SINGLE 65 EXO
26X2.50 ( 55-559 ) Black 60 FOLDABLE 860 3C MAXX TERRA 65 3C/EXO
26X2.50 ( 55/59-560 ) Black 60 FOLDABLE 930 SINGLE 65 ST/EXO
27.5X2.30 ( 58-584 ) Black 60 FOLDABLE 825 3C MAXX TERRA 60 3C/EXO/TR
29X2.30 ( 58-622 ) Black 60 FOLDABLE 925 DUAL 60 EXO/TR
29X2.30 ( 58-622 ) Black 60 FOLDABLE 925 3C MAXX TERRA 60 3C/EXO/TR
29X2.50 ( 63-662 ) Black 60 FOLDABLE 1,015 DUAL 50 EXO/TR
29X2.50 ( 63-622 ) Black 60 FOLDABLE 1,015 3C MAXX TERRA 60 3C/EXO/TR