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| *Vultures Knob>>>Mountain Bike |
How do I upgrade my 8-speed cogset to a 9-speed on my mountain bike? |
I've heard that the 8-speed hub can hold a 9 speed cassette as well. Would that mean that all I need to do to changeover my bike to be a 27-speed from a 24-speed is: (1) replace the cassette, (2) replace the chain, (3) replace the shifters?? Seems too simple. What am I missing? Yes you can you already have the answers except that your going to need to upgrade to a 9 speed derailleur for optimal performance some 8 speed derailleurs can be made to work but its best to just go with the 9 spd derailleur. Reading some of the other answers makes me wonder if any of these guys has actual experience in short if you don't know what your talking about don't answer the question, the cassette body on 8 speed it the same as a 9. The shifters have to be changed the cog set has to be changed and if the chain was new enough it would work but if your replacing the cog set i would go with a new one go with a SRAM chain its worth it. Source(s): 15 years in bike shops..... Get a new bike. Yours is probably engineered for the set-up you have on it. Ask at a GOOD bikeshop. Your analysis is too simple. Unless you're really attached to your bike, consider getting a new one. You 'can' replace an 8-gear cassette with a 9-gear, but you'll have to change the chain (which you've already noted) and the rear derailleur. It'd be easier to buy a newly built rear wheel assembly, but you'd still have to change the derailleur and chain. Unless the shifters are indexed, you shouldn't have to replace them. But you might as well if you're changing out the cassette. Again, you might consider just getting a new bike. It is important to understand that you won't be able to go any faster on a 27 gear bike than you can on a 24 gear bike. What the extra gears give you is the ability to transition more smoothly over terrain and speed so you can keep your cadence (pedal rpm) constant- the whole reason behind multiple gears. Note that I avoided the use of the term "speeds" when talking about this. Speed has nothing to do with the gear ratios on a bike... it is all about the rider. Additionally, you won't be able to use all 27 gears (or your current 24 for that matter) since you should never use the 2 "big sprockets" or 2 "small sprockets" as combinations because of the chain offset and also the length of the chain. It is true that it is mechanically possible to change from an 8 gear rear to a 9 gear by switching cassette, rear axle (sometimes), rear derailleur, chain, frame spacing (maybe), shifters, and possibly the chainrings (front sprockets) but at this point unless you have a good cache of parts already you could likely buy a new bike for less money. Should you decide to go ahead and try this anyway, be absolutely certain that the new shifters are compatible with your rear derailleur, that your rear derailleur can be used as for a 9, and that the narrower chain is compatible with your chainrings. I think the Shimano and SRAM websites have the tech information for that, but if you have components other than those it is a tricky situation unless you physically check compatibility. Good Luck! 26 years as a bike mechanic it's just that simple!! don't know why some of the answers are so long winded |
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