The transformation of methylcyclohexane was investigated at 450 degreesC for several contact times over six previously characterized HFAU, HMFI, and HBEA zeolites having framework Si/AI ratios either close to 15 or between 26 and 47. With all of the fresh samples, C-2-C-7 alkenes and alkanes, cyclopentane and methylcyclopentane (cracking products), dimethylcyclopentanes and ethylcyclopentane (isomers), and aromatics appear as primary products. Hydrogen and methane are also directly formed (methylcyclohexane protolysis) with HBEA-15, which presents very strong protonic sites, and with HMFI samples. A simplified kinetic model was established, and the rate constants leading to good agreement between experimental data and calculated yields of the main products were determined. Large differences in the rate constants are observed between the zeolite samples, which can be related to differences in acid strength and particularly to a pronounced influence of the zeolite pore structure.