Sunrace 8-Speed Freewheel

Product Information

Replacement bodies are not available for these early hubs, which can sometimes be identified by the narrow barrel, without the characteristic bulge on the right end. (The bulge is to accommodate the threading for the hollow bolt used on newer Shimano Freehubs) See the photos below, kindly provided by David Landsberg. Narrow chains bring other problems, though. They are usually more expensive and -- with 10 or more speeds -- don't last as long -- even when used in the intended system.

If you get the rear wheel rebuilt with the right kind 0f 7s Freehub, you will be able to use any 7s cassette as well as various other shortened cassettes (eg 8 from 9 or 9 from 10 etc) 7s freehubs are available (eg used) in 126, 130 or 135mm widths. In practice taking a 126 mm one or a 130mm one and respacing it to 128mm means it will fit in either a 126mm frame or a 130mm frame. When discussing cassettes, the terms "Road" and "Mountain" are marketing terms, not technical ones. Your Sugino may be 110mm bcd, in which case it will accept an inner ring down to 34 tooth. If 130 bcd, then a 38 is available, or 39 if 135 bcd. Although the most common Shimano bodies are interchangeable at the hub shell, you may have further complications due to incompatibility between your right side cone and the dustcap that comes with a replacement body. The dustcaps can usually be pried out and interchanged, or you can buy an appropriate right cone to match your new ratchet body.Triple" front derailers have a wide, shaped inner cage plate. They generally work OK with double chainrings as long as the step between the chainring sizes is matched to the derailer. 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. An additional complication is that "road" front derailer cages are shaped to fit well with a 52-53 tooth big chainring, while most current "mountain" front cages are shaped to fit with a 42-44 tooth big ring. 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. 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.

Now you thoroughly clean all the parts of the freewheel mechanism. I (John Allen) use solvent followed by a strong solution of dishwashing detergent and a water rinse. I dry the parts afterward with paper towels to prevent rust. A 38/39 will give you a gear similar to a 32, this was a common route to take in the era of your bike. Not all 8-speed cassettes are compatible. Campagnolo and Shimano 8-speed cassettes have different spacing, so it is generally not possible to achieve proper indexing when combining a Campagnolo 8-speed wheel with a Shimano shift system, or vice versa. 3. Is a cassette better than a freewheel tool? SRAM "ESP" or "Exact Actuation" derailers and shifters (generally designated by a decimal model number: 7.0, 8.0, 9.0 etc) can only be used if the shifter and rear derailer are both ESP. A Jtek ShiftMate pulley adaptor can make a SRAM shifter work with a Shimano derailer, or vice versa. All SRAM 10-speed derailers and shifters are of yet a third type. For example, Shimano doesn't make any true "corncob" (one-tooth-jump) cassettes for time-trialists or flatland riders. In 7 speed, the closest is the J (13/14/15/16/17/19/21).Although "Road" and "Mountain" hubs are no different as far as cassette fitting is concerned, they are different in terms of overall spacing. "Road" hubs generally use 130 mm spacing, while "mountain" hubs are 135 mm. In reality, the fancier parts aren't always the most suitable, in the same way that a Ferrari, while it is a great racecar, isn't at all as good for daily transportation as a Toyota -- there are practical issues of cost, reliability, serviceability and durability. With bicycle components, the performance gain with higher-end models is often minuscule. Remember, you account for 80 percent of the weight even if you are riding a rather heavy bicycle! The Shimano Hyperglide cassette body has become a de facto industry standard. Many other manufacturers make hubs and cassettes that are compatible with Shimano. There are exceptions and partial compatibilities. Some of the other manufacturers offer cassette bodies to fit different brands and models of cassettes. Dura-Ace 7800 and 7801 10-speed hubs (and Ultegra wheelsets) with the aluminum Freehub body and tall splines accept only Dura-Ace, Ultegra and 105 10-speed cassettes.