Skid Spots

The top row of the table below is the number of teeth on the chainring. The leftmost column of the table below is the number of teeth on the cog.

Table: Skid Spots

	32	33	34	35	36	37	38	39	40	41	42	43	44	45	46	47	48	49	50	51	52	53
11	11	1	11	11	11	11	11	11	11	11	11	11	1	11	11	11	11	11	11	11	11	11
12	3	4	6	12	1	12	6	4	3	12	2	12	3	4	6	12	1	12	6	4	3	12
13	13	13	13	13	13	13	13	1	13	13	13	13	13	13	13	13	13	13	13	13	1	13
14	7	14	7	2	7	14	7	14	7	14	1	14	7	14	7	14	7	2	7	14	7	14
15	15	5	15	3	5	15	15	5	3	15	5	15	15	1	15	15	5	15	3	5	15	15
16	1	16	8	16	4	16	8	16	2	16	8	16	4	16	8	16	1	16	8	16	4	16
17	17	17	1	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	17	1	17	17
18	9	6	9	18	1	18	9	6	9	18	3	18	9	2	9	18	3	18	9	6	9	18
19	19	19	19	19	19	19	1	19	19	19	19	19	19	19	19	19	19	19	19	19	19	19
20	5	20	10	4	5	20	10	20	1	20	10	20	5	4	10	20	5	20	2	20	5	20
21	21	7	21	3	7	21	21	7	21	21	1	21	21	7	21	21	7	3	21	7	21	21

I believe it is easier to access multiple cogs than multiple chainrings. So I recommend having a good sized chainring. If the chainring's teeth count is a prime number, then you'll maximize skid spots to the number of teeth on the cog, i.e. 53, 47, 43, 41, and 37.

Light Source: 2013 Magicshine MJ-808U

So I finally broke down and purchased a Magicshine light. One of my cycling friends owned one and it was super bright. He received complaints from drivers of cars like, "That's stupid!!" It's super bright to say the least. It's rated by the company at 1100 lumens. But in reality, I'm sure it's 1000 lumen tops.

I ordered the Magicshine MJ-808U. The "U" is for Ultimate Edition, according to the packaging. Waiting for it to arrive.