Shimano chains, again
02-10-20, 09:40 AM
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Shimano chains, again
Referencing my post yesterday regarding vintage (I guess) Shimano chains, does anyone know the difference between the Dura-Ace 7800 chain and the 7801? Are they interchangeable?
I have so far been unable to contact Shimano.
I have so far been unable to contact Shimano.
02-10-20, 10:26 AM
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from shimano;
7800;
- Hyperglide (HG) series 10-speed compatible chain, recommended for Dura-Ace drivetrains
- HG technology has chamfered inner plates to optimise shifting performance on HG sprockets
- Durability is assured through a chromising treatment on link pins, and the heat treatment of rollers, pins, and plates
- Mushrooming of the pins gives unsurpassed side-plate retention, enabling the chain to far exceed the BS/ISO standard for breaking force
- 5.88 mm chain width, optimised for 10-speedSuper Narrow HG drivetrains
- Zinc-alloy silver finish offers the longest lasting and best resistance to corrosion
- 114 links, 280 grams/ 7801;
- HG technology has chamfered inner plates to optimise shifting performance on HG sprockets
- Durability is assured through a chromising treatment on link pins, and the heat treatment of rollers, pins, and plates
- Mushrooming of the pins gives unsurpassed side-plate retention, enabling the chain to far exceed the BS/ISO standard for breaking force
- Optimised for 10-speedSuper Narrow HG drivetrains
- Zinc-alloy silver finish offers the longest lasting and best resistance to corrosion
- Chain Width: 5.88mm
- Links: 114
- Weight: 280g
02-10-20, 10:45 AM
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Shimano started issuing an 01 designation at some point and never announced why they changed. I know there were reported issues of sideplates cracking on some of the Ultegra and Dura-Ace chains of the 6700 and 7900 series which were later changed to 6701 and 7901 and obviously 7801's. I just have to guess that these were improved versions but again, just guessing. My neighbor switched his 6700 drivetrain to the KMC 10.93 and never noticed any difference at all in performance and gets the same mileage as the Shimano. You would also be fine with a 6701 Ultegra Chain to save some cash. Dura-Ace is just more $$ for only a very slight weight loss and no performance improvement. I would probably avoid any of the old "00" designated chains if you see any for sale.
02-10-20, 08:33 PM
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Not just the chain model number changed but, IIRC, the assembly pin did too. I generally don't bother with the highest grade as all chains of the same "family" share most of the important aspects (material, dimensions, shape) and only differ with cosmetic coatings or minimal weight loss. Having said that I do like the silver finishes, usually not found on the base level. Andy
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