70x22 with a 16" rear wheel produces the following via Sheldon's gear calculator. Probably a bit low for most folks but it could be made higher with a wider tire. Overall, it seems fine to me.
[h=2]Gear chart using
Gear Inches[/h]
[h=3]For 16 x 1.5 / 37-305 tire with 170 mm cranks[/h][h=3]With Custom Sprocket(s) Cassette[/h][h=3]With Shimano 8-speed Nexus, Alfine Rear Hub[/h][TABLE]
[TR]
[TH="bgcolor: yellow"]
0.53 (Low)[/TH]
[TH="bgcolor: yellow"]
0.64[/TH]
[TH="bgcolor: yellow"]
0.75[/TH]
[TH="bgcolor: yellow"]
0.85[/TH]
[TH="bgcolor: yellow"]
1.0[/TH]
[TH="bgcolor: yellow"]
1.22[/TH]
[TH="bgcolor: yellow"]
1.42[/TH]
[TH="bgcolor: yellow"]
1.62 (High)[/TH]
[/TR]
[TR]
[TD][TABLE]
[TR]
[TD][/TD]
[TH="bgcolor: yellow"]
70[/TH]
[/TR]
[TR]
[TH="bgcolor: yellow"]
22[/TH]
[TH="bgcolor: white"]22.6[/TH]
[/TR]
[/TABLE]
[/TD]
[TD][TABLE]
[TR]
[TD][/TD]
[TH="bgcolor: yellow"]
70[/TH]
[/TR]
[TR]
[TH="bgcolor: yellow"]
22[/TH]
[TH="bgcolor: white"]27.6[/TH]
[/TR]
[/TABLE]
[/TD]
[TD][TABLE]
[TR]
[TD][/TD]
[TH="bgcolor: yellow"]
70[/TH]
[/TR]
[TR]
[TH="bgcolor: yellow"]
22[/TH]
[TH="bgcolor: white"]32.0[/TH]
[/TR]
[/TABLE]
[/TD]
[TD][TABLE]
[TR]
[TD][/TD]
[TH="bgcolor: yellow"]
70[/TH]
[/TR]
[TR]
[TH="bgcolor: yellow"]
22[/TH]
[TH="bgcolor: white"]36.4[/TH]
[/TR]
[/TABLE]
[/TD]
[TD][TABLE]
[TR]
[TD][/TD]
[TH="bgcolor: yellow"]
70[/TH]
[/TR]
[TR]
[TH="bgcolor: yellow"]
22[/TH]
[TH="bgcolor: white"]42.8[/TH]
[/TR]
[/TABLE]
[/TD]
[TD][TABLE]
[TR]
[TD][/TD]
[TH="bgcolor: yellow"]
70[/TH]
[/TR]
[TR]
[TH="bgcolor: yellow"]
22[/TH]
[TH="bgcolor: white"]52.4[/TH]
[/TR]
[/TABLE]
[/TD]
[TD][TABLE]
[TR]
[TD][/TD]
[TH="bgcolor: yellow"]
70[/TH]
[/TR]
[TR]
[TH="bgcolor: yellow"]
22[/TH]
[TH="bgcolor: white"]60.8[/TH]
[/TR]
[/TABLE]
[/TD]
[TD][TABLE]
[TR]
[TD][/TD]
[TH="bgcolor: yellow"]
70[/TH]
[/TR]
[TR]
[TH="bgcolor: yellow"]
22[/TH]
[TH="bgcolor: white"]69.2[/TH]
[/TR]
[/TABLE]
[/TD]
[/TR]
[/TABLE]
This small version of the chart can be printed, cut out, and taped to your bicycle for reference.
[TABLE]
[TR]
[TH]
Low[/TH]
[TH]-[/TH]
[TH]-[/TH]
[TH]-[/TH]
[TH]-[/TH]
[TH]-[/TH]
[TH]-[/TH]
[TH]
High[/TH]
[/TR]
[TR]
[TD][TABLE]
[TR]
[TH]
22.6[/TH]
[/TR]
[/TABLE]
[/TD]
[TD][TABLE]
[TR]
[TH]
27.6[/TH]
[/TR]
[/TABLE]
[/TD]
[TD][TABLE]
[TR]
[TH]
32.0[/TH]
[/TR]
[/TABLE]
[/TD]
[TD][TABLE]
[TR]
[TH]
36.4[/TH]
[/TR]
[/TABLE]
[/TD]
[TD][TABLE]
[TR]
[TH]
42.8[/TH]
[/TR]
[/TABLE]
[/TD]
[TD][TABLE]
[TR]
[TH]
52.4[/TH]
[/TR]
[/TABLE]
[/TD]
[TD][TABLE]
[TR]
[TH]
60.8[/TH]
[/TR]
[/TABLE]
[/TD]
[TD][TABLE]
[TR]
[TH]
69.2
[/TH]
[/TR]
[/TABLE]
[/TD]
[/TR]
[/TABLE]