Skip to content

Monthly Archives: October 2009

Nexus-7 exact ratios and tooth counts “from the source”

Tuesday, October 27, 2009

Previously, I have tried to find “theoretically” the tooth counts of the Nexus-7 internal gear hub. Some nice numbers were obtained, but there were some suspects (you may think yourself what can be wrong with the numbers given in the link). Soon after, I disassembled the real hub and counted the teeth of all rings. [...]

Filed in Cycling | | Comments (0)

Nexus-7 gear tooth counts and exact transmission ratios – wrong version

Thursday, October 22, 2009

Vendors of internal gear bicycle hubs naturally give the transmission ratios of own products. But I was always curious how exactly these ratios are obtained, i.e. which planet gears are engaged in which combination and how many teeth each gear has. This information was surprisingly hard to find – in fact, the only vendor [...]

Filed in Cycling | | Comments (0)

Difficult elementary school math problems

Friday, October 2, 2009

Many math problems are fascinating. Often they are also difficult, so that only those who have high enough education can understand their beauty. But sometimes a really simple problem – such that anyone with just the elementary school knowledge can solve it – can be quite cute as well. Most elementary school math questions are [...]

Filed in Uncategorized | | Comments (0)