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Difference between ST-5510 and ST-6510?

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Difference between ST-5510 and ST-6510?

Old 02-28-21, 12:52 PM
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Jicafold
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Difference between ST-5510 and ST-6510?

How can you tell the difference between a Shimano Ultegra ST-6510 and Shimano 105 ST-5510 if there are no name plates and the part number is illegable? Is there another way to tell the difference?
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Old 02-28-21, 02:18 PM
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Have you pulled the cover down, up or off and looked to see if it's imprinted on the body or bracket of the shifter? That's were it is on my more modern Tiagra, 105 and Ultegra STI's.

Otherwise perhaps weigh them if you can find out what they advertised the weight of them as. Or look for a unique part number that might be on one of the parts.

Beside the materials some of the parts may be made from and the tighter manufacturing tolerances the Ultegra might have been held to, they are essentially the same mechanically.

https://si.shimano.com/pdfs/ev/EV-ST-6510-1950A.pdf

https://si.shimano.com/pdfs/ev/EV-ST-5510-2171.pdf
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Old 02-28-21, 02:38 PM
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As Iride01 said, the model number is imprinted on the plastic body of the shifter. Peel the rear portion of the hood forward and the number is right there. In this case: “STR7000”

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Old 02-28-21, 02:59 PM
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I know the number is there. It just has a bunch of glue, etc on it for some reason. Thank you.
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Old 02-28-21, 03:45 PM
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Originally Posted by Jicafold View Post
I know the number is there. It just has a bunch of glue, etc on it for some reason. Thank you.
Our maybe sloshed drink and sweat from the previous user.
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Old 02-28-21, 04:36 PM
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A lot of the internal part #'s are the same.
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Old 02-28-21, 04:40 PM
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Difference between ST-5510 and ST-6510?
.....about 1000. Sorry I couldn't help myself. I'll see myself out.....
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Old 02-28-21, 07:03 PM
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Originally Posted by dedhed View Post
A lot of the internal part #'s are the same.
That's another question really. What excatly is the difference between them that makes the Ultegra more expensive. I don't have 2 so I could weigh them.

.....about 1000. Sorry I couldn't help myself. I'll see myself out.....[/QUOTE]


That's hilarious. ​​​​​​​
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Old 02-28-21, 07:24 PM
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Originally Posted by Jicafold View Post
That's another question really. What excatly is the difference between them that makes the Ultegra more expensive. I don't have 2 so I could weigh them.
The better tier group of Shimano's stuff is usually some lighter material that also wears at least as well as the lesser tier group. But that material is usually more expensive stuff and sometimes demands more cost to manufacture.

If you looked at the part numbers, most of what was the same was just the springs, spacers and screws and some of the tiny things where weight can't be saved.

If you get to a bike shop that has some 105 and DuraAce components laying out, pick some up. You'll be surprised at the noticable difference. Even the cassettes, where one would think a cog is just a cog.
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Old 02-28-21, 08:41 PM
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Originally Posted by Jicafold View Post
That's another question really. What excatly is the difference between them that makes the Ultegra more expensive. I don't have 2 so I could weigh them.

.....about 1000. Sorry I couldn't help myself. I'll see myself out.....

That's hilarious. [/QUOTE]

You've pretty much summed it up yourself.

The slight changes might be the actuator mechanism, usually an oddly shaped piece of material that smacks another odd shaped part.
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Old 02-28-21, 09:50 PM
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You didn't say why you need to know, does it even make a difference at this point? If you need 9 speed shifters you will be lucky to find good ones from either group.
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