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| >Upgrading to 9-Speed Do I need new wheels if I upgrade from 8 speed to 9 speed? The width of the cassette for Shimano 8 speed and Shimano 9 speed is the same, so your 8 speed wheels will work fine with a 9 speed cassette. What parts do I need to upgrade from 8 to 9 speed? You will need a new cassette, new shifters, a new chain, and a new rear derailleur. Everything else should work fine. Can I use an 9-speed derailleur with a 8-speed cassette? Absolutely. As long as it can handle the spread on the cassette, you'll be fine. All reasonably modern derailleurs will handle this. The derailleur is a "dumb" component - it does what the shifter tells it to do. Go Back >Chains Why does my chain keep dropping off of my chainrings or cassette? The most likely cause is that your derailleurs are not properly adjusted, but there could be many other reasons. If your chain and cassette are both new, it may be that your chain is too long. Resizing the chain might solve the problem. If you have been using the same chain and/or cassette for many, many miles, or longer than you can remember, and your gears are starting to skip or you are dropping the chain frequently, then it may be time to replace chain, cassette, or both. In general, chains and cassettes wear down simultaneously (because they work together), and for best results, both should be replaced at the same time. Go Back >Cassettes When I order a cassette what do the numbers (12-34, 11-27, …) mean? The numbers you see when ordering a cassette relate to the number of teeth on the smallest and largest cogs. A smaller first number will give you more top end speed while a larger second number will give you an easier gear for climbing. What gearing range on a cassette is right for me? Cassettes have two numbers, the front refers to the smallest cog and the second number refers to the largest. With a smaller front cog, you will be able to go faster and with a larger second number, you will have a better climbing gear. A cassette with more closely related numbers will also have smoother shifting. Racers like to have a "close ratio" so that they can have smooth acceleration and may not have to do really hard climbing. Hybrid and mtb bikes need a much broader range for comfort in pedaling and the need to climb steep hills. If you are a new rider, you'll want to choose a cassette that has a comfortable upper range for you. If you're a racer and in shape, choose one of the cassettes with a smaller lower cog and narrower range. Call us if you need help deciding. How do I install a new cassette on my rear wheel? To remove and install a cassette you will need two specialized tools, a chain whip, and a lock ring tool. The chain whip is only necessary when removing the cassette. It is used to hold the cassette in place when the lock ring is loosened. Once the lock ring has been removed the cassette will slide off. To install, simply slide the cassette onto the freehub body (the splines will only allow installation in the correct position). The lock ring and tool must be used to tighten everything down. Simply thread the lock ring on to the end of the freehub, using the lock ring tighten it until you hear what sounds like a ratcheting noise. Check for tightness by trying to wiggle the cogs independent of each other. Can I use an 8-speed derailleur with a 9-speed cassette? Absolutely. As long as it can handle the spread on the cassette, you'll be fine. All reasonably modern derailleurs will handle this. The derailleur is a "dumb" component - it does what the shifter tells it to do. Go Back >Chainrings How can I measure the size of my chainrings? Chainrings are usually stamped with sizes (94/8) 5-arm compact, (74/110) 5-arm Standard or 64/104) 4- arm. If they are not stamped you can also measure them. To measure your chainrings, draw a circle through the center of all the bolt holes used to connect the chainring to the crank arm. Next, measure the diameter of the circle (in millimeters). On a mountain bike, the outer and middle rings use one bolt circle diameter and the inner uses another. Do I need to use an 8-speed chain with 8-speed chain rings and a 9-speed chain with 9-speed chainrings? 9-speed rings have thinner teeth and the offset of the tooth creates a narrower space from the teeth of one ring to the teeth of the next. Using the incorrect ring type can cause over-shifts, under-shifts, unsuccessful shifts, skipping, chain suck when the chain gets caught between rings, chain suck when the chain won't let go of the ring. Always use the appropriate chain and chainring combination for flawless shifting. How can I be sure to choose the right chainrings? If you plan to replace or upgrade your bike's chainrings, you must match the new chainrings to your existing cranks. Chainrings come in a variety of sizes and are measured by their bolt-center diameter (BCD). Chainrings which have different BCDs are not compatible, even if the chainring has the same number of teeth! Additionally, chainrings come in either 4 arm or 5 arm configurations to match various crank arms. Your cranks and chainrings must match. Determining your bolt center diameter: BCD is equal to the diameter of an imaginary circle drawn through the center of the bolts which secure the chainring to the cranks, measured in millimeters. Regardless of whether the crank has 4 arms or 5 arms, the BCD is measured the same way. Note: the BCD is NOT simply the distance between two bolt holes! When measuring a double crankset, the same BCD is used for both the inner and outer chainrings. If you are measuring a triple crankset, be sure to measure the BCD of both the inner chainring and the middle/outer chainrings, as they are different. Common size pairings: Mountain bikes and other bikes with triple cranks have two different BCDs per bike. The inner (smallest) chainring has it's own BCD, while the middle and outer chainrings share the same BCD. Three different sets of BCDs are common on mountain bikes: First a 58mm (inner) and 94mm (middle, outer). Second is 74mm (inner) and 110mm (middle, outer) setup. Third is a 64mm (inner) and 104mm (middle, outer) configuration. For road bikes and other bikes with double cranks, the inner and outer chainring share a common BCD. The most common BCD found on double cranks is 130mm. Once you've determined the correct BCD for your cranks, simply make sure to order chainrings with the same dimensions for proper fit. Go Back |
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