A4 scale = 70%
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A4 scale = 70% |
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Cycle transmission notes | |
These notes answer some of the most frequently asked questions about the products we supply. They attempt to correct a few myths and explain other points about cycle derailleur transmissions which are not readily available elsewhere. We have tried to remain impartial and categorically deny any commercial or spiteful incentive where we question someone else's products. All recommendations are simply made as a result of our own experiences as cyclists and engineers, and from feedback received from our customers over the years. Please let us know if you spot any errors, omissions or something with which you disagree.
Multi-speed derailleur gears are used on most cycles today. They are easier to understand than most people realise and all the parts can be readily examined and worked upon. Virtually everything can be replaced individually and, because of this, gears can easily be customised to suit the way you ride.
Highpath specialises in chainrings, sprockets and cranks - and there are, literally, millions of combinations! We understand what works with what and we understand the consequences of the choices you make.
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You can fit up to 10 rear sprockets on your cycle, depending on what system you have. But, for long-term reliability, the fewer you fit the better since, the more sprockets you use, the more your chain will be forced to bend sideways and the faster it will wear out. And a worn chain will quickly wear your sprockets and chainrings too. Cyclists who use properly setup hub gears, with just one sprocket and a 1/8" bushed chain, don't suffer from this problem and their equipment tends to last much longer.
Any current 3/32" chain can be used with gears up to 8 speed but narrower ones are needed for 9 and 10 speeds. Modern chains are more flexible than the old 'bushed' types, in order to cope with the greater number of rear sprockets that have become fashionable but, unfortuantely, they don't last as long and have to be replaced far more regularly.
Replace a chain when it has stretched by 1% (ie. when 24 links measure 308 mm or more between centres). And always replace your chain whenever you install a new chainring or sprocket. Most new chains are longer than necessary and must be shortened; to find the correct length for your cycle, run it round the largest chainring and the largest sprocket, pull it tight and then add 2 or 3 extra links.
You must keep your chain clean and well oiled at all times. Although a variety of special oils is available, remember that any type of lubrictating oil is better than none at all. (Long distance tourists are very well served by the dregs of engine oil they salvage from discarded cans at petrol stations!) Simply remove any dirt (an old toothbrush may be useful) and then apply the oil liberally, leaving it to soak through to the inside surfaces before wiping off as much excess as you can. Oil needs to be on the inside of the chain where you can't see it, not on the outside where it only serves to attract dirt.
| © Chris Bell, 2005 |
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| HIGHPATH ENGINEERING Cornant, Cribyn, Lampeter, Ceredigion, SA48 7QW, Wales, UK phone / fax: +44 (0)1570 470035 (UK office hours only) email: 
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