I know it was being produced in 1984 (because that's when I bought mine) and I think this was the first year of production but I'm not sure how many years it was produced after that.
Depends on their actuation ratio. Shimano 10-speed MTB line is rumored not to match up to 9-speed shifters. Shimano 10-speed road derailers are supposed to work with 9-speed systems.
Dura-ace 7800 10 speed, but it all depends on which drivetrain (Shimano, Campy or SRAM) you have.
No. Shimano for instance originally supply a special joining pin instead of a Master link(or quick link). Chains for single-speed or internally geared bikes can usually be opened or closed using only the stock pins that are already used everywhere in the chain. Quicklinks are useful for maintenance and can be easily retrofitted to any bike chain.
Depends, but usually not. A Campy 10 speed + a Shimano derailer will index cleanly with a Shimano 8 speed cassette. Other combos are theoretically not clean matches, but some people consider them to run well enough to be useful anyhow. If you do a net search for "shimergo" you'll find a link to an UK site listing possible combos. There's als a company called JTEK who make adapters which allow you to mix and match. Brakes don't care and can be mixed either way.
Although such gears were built in the late 1800''s, Paul de Vivie invented a two speed rear derailleur in 1905. Simplex introduced a system in 1938, Suntour in 1964 and Shimano were successful in 1985. Shimano together with Campagnolo are now the two successful manufacturers
Price of Hero Octane Estes 26T 21 speed bicycle : Rs. 7,525Bicycle Features:Front and rear shoxAluminum alloy frameV-brakes21-speed Shimano Gear System
Hero Octane Orion 26TPrice of Hero Octane Orion 26T 21 speed bicycle : Rs. 6,600Bicycle Features:Front and rear shoxAluminum alloy frameFront and rear V-brakes21-speed Shimano Gear System
Hero Octane Genius 26TPrice of Hero Octane Genius 26T 21 speed bicycle : Rs. 19,125Bicycle Features:Front and rear shoxAluminum alloy frameFront and rear disc brakes21-speed Shimano Rapid Fire Gear System
Ibo speed is 290 fps
Hero Octane Genius 26TPrice of Hero Octane Genius 26T 21 speed bicycle : Rs. 19,125Bicycle Features:Front and rear shoxAluminum alloy frameFront and rear disc brakes21-speed Shimano Rapid Fire Gear System
Hero Genius 26T Price of Hero Octane Genius 26T 21 speed bicycle : Rs. 19,125Bicycle Features:Front and rear shoxAluminum alloy frameFront and rear disc brakes21-speed Shimano Rapid Fire Gear System
No. That is, if you're referring to the newer internally-geared 7-speed hubs from Shimano (Nexus) and SRAM (S7). Both of these have seven internal gear ratios (like the old 3-speeds on steroids) and a coaster brake. They are installed using a single chainring at the cranks and a single rear cog. So no derailleurs needed. BTW, the Nexus (or its sibling the Alfine) hub from Shimano has been made in 4, 7, 8 and 11 ratios.