Another oddity today, £4 (that included another wheel with an XT disc hub with a very knackered Sun rim).
Anyhoo, can't find any info on this, smacks of Far East BSO, some of the spellings and phrases are just amazing! I personally love the 'Brake Powerfull', (yes two l's) on the seat stays.
As far as I can see the Brand is Aerotrack Designs, Quantum being the 'brand' and Onyx as a model. But I can not find anything at all about them on the web. It was also wired up U.S. style, i.e. brakes the wrong way round. :/
Has some reasonable LX bits on it though that should clean up nicely.