Sunrace 8-Speed Freewheel

£9.9
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Sunrace 8-Speed Freewheel

Sunrace 8-Speed Freewheel

RRP: £99
Price: £9.9
£9.9 FREE Shipping

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Description

The left side of the outer freewheel body looks like this. The steps of the rachet and a bearing race are visible. The same procedure works for off-brand Freehubs that have a LH threaded fastener accessed from the LH side of the hub, too. It doesn't work with freehub bodies that screw directly into the hub shell. When discussing cassettes, the terms "Road" and "Mountain" are marketing terms, not technical ones. The right side of the outer freewheel body looks like this when all cleaned up. A bearing race is visible.

Within a given brand/style of rear derailer, all "speed numbers" are generally interchangeable. This applies to all indexable models, basically everything manufactured since the late 1980s. There are a few exceptions: These chainrings have the teeth slightly farther to the right than the older chainrings to work a little better with the narrower chains. There is no difference whatever in the crank spiders.Old Chainrings, New ChainsThere is a lot of confusion about the compatibility of narrow 9- and 10-speed chains with older cranksets. Shimano says you should replace the inner chainring(s) with specially designated 9- or 10-speed ones, but then they're all too eager to sell you stuff, whether you need it or not. Mountain" hubs will likely be slightly better sealed against dirt and mud than "road" hubs, but this is rarely an issue in practice. The wider 135 mm spacing will generally result in a slightly stronger wheel due to reduced dishing of the spokes. With other freewheels, reassembly can be more difficult. In days of yore, there were special bobby-pin-like clips to hold the pawls compressed against their springs while you re-assembled the freewheel. These are no longer available.

But also, most Uniglide Freehubs can be updated by installing a Hyperglide ratchet body. This is an easy and inexpensive modification (see below.) SpeedsIn the 1980s, these two approaches were combined to create 7-speed freewheels, with 5 mm ("Ultra") spacing that would fit the same 126 mm hubs as "standard" 6-speeds. In practice this "problem" almost never materializes. Many, many cyclists are using 9- and 10-speed chains with older cranksets and having no problems whatever. New Chainrings, Old ChainsGoing the other direction, using wider chains with chainrings intended for narrower chains is not generally a major problem if there's only a one- or two- generation difference. The only problem you might run into is that the chain will be more liable to rub on the inside of the bigger chainrings in the small/small crossover gears, gears you shouldn't be using in any case. Shimano wants you to use one of its standard combinations, and offers a wide-enough choice to suit the needs of most cyclists, but you don't have to if you don't want to! Ultra Six ®" spaced 6 speeds used a closer spacing, around 5 mm. This permitted an Ultra Six ® freewheel to directly replace a standard 5-speed unit on a 120 mm hub. The key to making this work was the use of a narrower chain. The interior width of the chain was the same as always, but the new narrower chains used shorter rivets, so the ends of the rivets didn't protrude past the outer chain plates, as the rivets in traditional chains did.

Unless you are willing to put up with friction shifting, you need to install new shifters. Indexing handlebar-end shifters, top-mount shifters or downtube shift levers let you know how to shift by feel. Brake-lever shifters return to the same position after every shift, so you don't know what gear you are using. They also tend to be expensive. Brazed-on bosses for downtube shifters on some older frames will not fit today's index shift levers or cable stops, so you will need to use a clamp-on adapter. Hyperglide cassettes are commonly sold as a unit There are dozens of different cassette combinations available. Most cassettes are designated by a one- or two-letter code. This is easy to do, and generally requires no disassembly. Warning, though: unless the freewheel body is clean, the oil will carry grit and grime into the mechanism! Triplizer (adaptor) chainrings for 130mm BCD area available from Spa cycles, but IIRC a record ace will have a 144mm BCD chainset in which case a 'red clover' triplizer might be the only off the shelf option. SpeedsIn the early 1990s, the industry moved to 8-speed clusters with 130 mm spacing. 8-speeds were available in both freewheel and cassette hubs. As with the move from 4- to 5-speed, and from 5-speed to 6-speed, this required adding spacers to the right-hand end of the axle to keep the chain from rubbing on the frame.



  • Fruugo ID: 258392218-563234582
  • EAN: 764486781913
  • Sold by: Fruugo

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