New-Old-Stock Shimano SuperGlide (Third Generation) Chainring...53T / 130mm BCD

Description: New-Old-Stock Shimano SuperGlide (Third Generation) Chainring...53T / 130 mm BCD / Silver Finish Thank you for your interest in this item and please visit our store for other offerings. We have very reasonable shipping terms and combine orders to save money (for customers) on shipping costs. We also maintain customer friendly return/refund/exchange policies. Product Description: This offering is for a new-old-stock Shimano SuperGlide (SG) round chainring in a silver finish. It's a 53T aluminum alloy model from around the turn of the century and has a bolt-circle diameter (BCD) of 130 mm. This is a third generation model and it includes some improvements from the earlier generations. All generational models include a chain guard peg to help prevent an overshifted chain from lodging itself between the backside of the crankarm and this chainring. I also see tooth profile variations on these models, as discussed in more detail below. Although, these third generation chainrings also include three sets of pins (or ramps) to help facilitate the upshift from a smaller chainring. For those that are interested, the second generation model includes two sets of these pins. Finally, this chainring includes the "B" designation, which indicates this large chainring was designed to be a factory match to a 39T small chainring on a double crankset. Now I have received feedback that folks are able to match this B-Type chainring with larger 42T chainrings and still achieve functional shifting performance. When I say functional, I mean the shifting performance is okay for most users, but a 39T chainring will still likely shift a little better, especially under heavy load. Shimano made better quality chainrings during this era, but through shop catalog research we confirmed these are Shimano 105 equivalent rings...so still a good quality offering with a number of Shimano double crankset applications. I can also confirm this chainring would have been marketed as a 9-speed model, but as noted below, this chainring will function fine on other drivetrains. For those that are interested, the Shimano 105 groupset included a 9-speed drivetrain from 1999 to 2005. Additionally, Shimano spec'd a number of their road triple cranksets with the same BCD measurement for the middle ring and outer (largest) ring, which provides other compatible options for this offering. Although, please do not consider these rings for a Shimano mountain bike triple cranksets, as they generally have a smaller BCD measurement. We have also noted the width of these rings appears about the same as the first and second generation SuperGlide models, but still slightly thinner at it's mounting points relative to older Shimano chainring models. Our best guess is this slightly thinner design is to bring the rings closer together (when mounted) to better accommodate the narrower chain required for a 7/8/9-speed cassette/drivetrain (relative to the older 5/6-speed drivetrains). Please understand, this observation is focused primarily on the entire ring design and not necessarily the teeth...as the teeth on this chainring are compatible with the relatively standard 1/2" x 3/32" chain. We also believe these chainrings may be used on any number of drivetrains (5, 6, 7, 8 and 9-speed drivetrains) with a compatible chain...meaning a chain with an appropriate external width for the intended drivetrain. If we had to make a recommendation, we would probably lean towards a 7, 8 or 9-speed drivetrain, but there is some flexibility here...as alluded to above. With respect to condition, they are new and unused...and although bulk-packed...they are still in fairly nice condition (with some light shopwear, but no signs of wear on any of the teeth). General notes regarding SuperGlide (SG) design/techologies... From what we can tell, Shimano introduced the SuperGlide chainring in the early 90's. At a glance, the tooth design on the first/second generation SuperGlide chainrings appears fairly similar to older (pre-SuperGlide) Shimano chainrings. Both have beveled teeth to facilitate shifting, but the SuperGlide chainrings are the first to introduce slight variations in the shape of selected teeth (referred to as the tooth profile) at the two points of lowest pressure on the chainring (i.e., where the pedaling effort is generally at it's weakest state). These changes to the tooth profile are subtle, but we are able to notice slightly different shapes to some teeth in this low pressure area (and especially on the larger chainrings). More specifically, some teeth appear narrower (but still the same height), while other teeth look as if they have been "squashed" slightly, as they appear shorter and a little wider. Whatever the tooth profile changes, Shimano claims the computer aided design facilitates shifting on the front chainrings by limiting the "shift shock" (where the shift is sudden and dramatic) and chain throwing occurrences. We are not entirely sure if these subtle tooth profile differences result in the significant shifting performance claimed by Shimano, but our guess is they probably offer some modest improvements over predecessor models with more uniform tooth profiles. Terms and Conditions: You may visit our store by clicking on this "Store Home Page" link and please note the product categories on the left side of our "Store Home Page". We have also moved our "Terms and Conditions" to a separate page within our Ebay store. You may navigate to this page by clicking on the link on the left side of our "Store Home Page" (below the product categories) or you may click on one of our "Terms and Conditions" direct links herein. Note to international customers regarding shipping... We apologize to those that feel some of our international shipping charges are too high. We only charge actual shipping rates, but once an order exceeds a certain amount, we hesitate to use the least expensive US Postal Services First Class International service. We feel this way, because this service is not trackable or insurable...so more risk of loss. We prefer the US Postal Services Priority Mail International service for more expensive orders, because this service is trackable at USPS.com and insurable...so less risk of loss. Unfortunately, this service is more expensive, especially for smaller/lighter packages, relative to the First Class International service. We are sorry about these higher shipping costs, but hopefully our notes help to explain why this is the case. Note to international customers regarding customs... We also apologize to those that feel their country import taxes, duties and brokerage fees are excessive. As a small US business, we are required by customs' laws to declare each order as a retail sale. Additionally, the declared order value must be equal to total store purchases and/or winning auction bids (less any shipping costs, as these are not considered in the declared value). As a result, each customer will be responsible for paying his/her own country taxes, duties and brokerage fees, which will be collected upon delivery. Again, we apologize for these additional costs, but we cannot afford the penalties and fines that come with breaking customs' laws...so we have to strictly abide by them.

Price: 69.99 USD

Location: Argonia, Kansas

End Time: 2024-05-18T15:50:00.000Z

Shipping Cost: N/A USD