ST1100 Front Disk Replacement

[DeanR]

Using that type of caliper doesn’t give a true representation of the rotor thickness, since the measuring surface is so long. Next to a proper brake rotor caliper, the next best tool for the job is a micrometer, preferably with a pin for one of the measuring points.

I use one similar to this one:

I use one like this, but have to re-teach myself how to read it each time!

 

[dwalby]

Using that type of caliper doesn’t give a true representation of the rotor thickness, since the measuring surface is so long. Next to a proper brake rotor caliper, the next best tool for the job is a micrometer, preferably with a pin for one of the measuring points.

And, as the rotor wears it develops a lip at the circumference (on the non-anti-dive side at least) that makes using a caliper difficult to step over the lip to get the correct measurement on the worn surface. On the anti-dive side the pads extend all the way to the edge of the rotor, so a lip doesn't form on that rotor.

 

[Al st1100]

So, my next BIG question now, is what else can I do whit the $800 I was expecting to spend there.

Make a donation to my favorite charity, ME..

 

[ST1100Y]

FYI:

David Silver Spares

David Silver Spares Honda Part Number Search

www.davidsilverspares.com

David Silver Spares

David Silver Spares specialise in Honda motorcycle parts from the 1960's to 2001 models

www.davidsilverspares.com

 

[ChriSTian_64]

Thanks for the tip Gabe. Good idea. ; -)

We never have enough tool, anyway

 

[ChriSTian_64]

Christian:
Whatever happened to your backyard garage/workshop you planning about a year ago. Did you ever build it?
If not- put the money towards that.

ah-ha ! You remember this one, eh ?
And I remember you gaved me very good advices too, Andrew.

Yeah, I don't know what happend last summer....
I had as much fun working on my bike than riding it, and let me tell you : I had the time of my life.
But first thing I knew, october was there, it was starting to be dark and freezing cold.

So I find a guy who had still one place to rent in his heated garage.

So, yeah, next summer, as you suggested, I will probably buy a shed and they will deliver it in my backyard.

I would have prefer a concrete floor, but, It is much more simple, with the city's regulation, to have something smaller than 100 square foot with a wooden floor. They then considers it as a removable shed.

So, I will get something like 8 x 12 foot and... that will be it.

 

[CYYJ]

Using that type of caliper doesn’t give a true representation of the rotor thickness...

That is correct. In fact, it's not possible to easily measure rotor thickness with a caliper, this because the rotors usually have a ridge around the outer edge, and a caliper would measure from the widest point (the ridge), not from the worn surface of the rotor.

It could be done, I suppose, if one used shims (for example, coins) on either side of the worn surface when taking the measurement, and then measured the shim thickness and deducted it from the gross measurement.

A micrometer such as the one illustrated in your post would be the preferred tool, but micrometers tend to be expensive devices not commonly found in home toolkits. A caliper such as the one I used to measure the coins in post 17 above is less expensive and all around more useful to have. But, it would require that shims be used if someone wanted to measure the thickness worn surface of a brake rotor.

FWIW, I have a micrometer - but only because one was passed down to me by my father-in-law when he retired from his work as a machinist.

Michael

 

[Capital]

Just a theory yet to be applied in practice when I'm in the garage. If one manages to cover one of the rotor holes from one side using something flat (e.g. a shim), using the micrometer's pin on the other end could also be an option (similarly as measuring tire tread depth). Need to validate by measuring this, then the standard way and comparing

 

[dwalby]

Just to add a dose of reality to this thread, there are cheap micrometers available that are perfectly fine for this application. We're not measuring anything critical, just trying to get a decent estimate on the thickness of the rotor, and comparing it to the 4.00mm minimum thickness spec.

As you measure different places along the rotor surface, your measurement will vary by a few 0.01mm, so having a micrometer that is accurate to, and reads to 0.001mm is useless, the rotor isn't uniform enough for that to be of any value. Any cheap mic will be good to 0.01mm accuracy, and even that is overkill for this application.

I have a few micrometers, a cheap one that I bought new somewhere I can't remember, a used Mitutoyo that I picked up off Ebay for about $25, and a digital one that I got from Harbor Freight. For this application they're all pretty much the same, so you don't have to spend a lot of money to get something useful, and it can also be used to measure the occasional un-marked valve shim.

 

[ReSTored]

............... there are cheap micrometers available that are perfectly fine for this application. We're not measuring anything critical, just trying to get a decent estimate on the thickness of the rotor, and comparing it to the 4.00mm minimum thickness spec.

+1 above. For my purposes I purchased this one from Amazon and it's accurate enough for what I use it for.

Accusize Industrial Tools 0-1'' Range x 0.0001'' Resolution Ultra Precision Carbide Tipped M-Type Outside Micrometer, EG00-0001: Amazon.ca: Industrial & Scientific

Accusize Industrial Tools 0-1'' Range x 0.0001'' Resolution Ultra Precision Carbide Tipped M-Type Outside Micrometer, EG00-0001: Amazon.ca: Industrial & Scientific

www.amazon.ca

 

[mello dude]

Just to add a dose of reality to this thread, there are cheap micrometers available that are perfectly fine for this application. We're not measuring anything critical, just trying to get a decent estimate on the thickness of the rotor, and comparing it to the 4.00mm minimum thickness spec.

As you measure different places along the rotor surface, your measurement will vary by a few 0.01mm, so having a micrometer that is accurate to, and reads to 0.001mm is useless, the rotor isn't uniform enough for that to be of any value. Any cheap mic will be good to 0.01mm accuracy, and even that is overkill for this application.

I have a few micrometers, a cheap one that I bought new somewhere I can't remember, a used Mitutoyo that I picked up off Ebay for about $25, and a digital one that I got from Harbor Freight. For this application they're all pretty much the same, so you don't have to spend a lot of money to get something useful, and it can also be used to measure the occasional un-marked valve shim.

Agree with that, we're not checking an engine build or something like that. There are plenty of inexpensive options to get the job done. (Although, Miyotoyo metrology products are awesome.

 

[beemerphile]

Using that type of caliper doesn’t give a true representation of the rotor thickness.

This is especially true once the disc has significant wear on it and there is an unworn rim on the outside where the pads didn't contact.

Great fix on the battery door Michael.

 

[Andrew Shadow]

I would have prefer a concrete floor, but, It is much more simple, with the city's regulation, to have something smaller than 100 square foot with a wooden floor. They then considers it as a removable shed.

Have you checked the guidelines in your area to be sure? I am within the city of Montreal. In my borough, a building permit is not required for a garden shed. Regulations regarding proximity to the property line and the size in relation to the house and the lot are all that is specified and the homeowner is expected to respect them. There is nothing regarding what type of floor. If you can build it on a concrete slab all the better.

 

[Andrew Shadow]

This is especially true once the disc has significant wear on it and there is an unworn rim on the outside where the pads didn't contact.

If someone doesn't have a micrometer, many, if not most, vernier calipers have stepped jaws that open up at the heel end. The opening is wider there than it is along the measuring portion of the jaws. This step clearly can be seen in both of the verniers pictures in posts 13 & 17. This step allows the vernier to be slid beyond the lip on the edge of the disk while still allowing the measuring jaws to close against the friction zone. This step is there for just such a purpose. The measurement that the vernier would give would be more than accurate enough for measuring a disk unless the disk was badly gouged.

 

[Ron]

Back to the rotors. When you need them, check with Partsfish. I don't know if they ship across the border. They list the rotors for $278 (USD).

2000 Honda ST1100 A FRONT WHEEL (1) | PartsFish.com

Shop online for OEM FRONT WHEEL (1) parts that fit your 2000 Honda ST1100 A, search all our OEM Parts or call at 800-964-1882

www.partsfish.com

 

[dwalby]

If someone doesn't have a micrometer, many, if not most, vernier calipers have stepped jaws that open up at the heel end. The opening is wider there than it is along the measuring portion of the jaws. This step clearly can be seen in both of the verniers pictures in posts 13 & 17. This step allows the vernier to be slid beyond the lip on the edge of the disk while still allowing the measuring jaws to close against the friction zone. This step is there for just such a purpose. The measurement that the vernier would give would be more than accurate enough for measuring a disk unless the disk was badly gouged.

possibly, but when the disk nears its wear limit, you've got a (nominally) 0.5mm lip on each side of the rotor, I'm not sure the caliper can accommodate that much of a lip. I have calipers and micrometers and don't bother with the calipers for this job because the mic is so much easier to use, and move along various parts of the rotor surface.

 

[jrp]

[

That is correct. In fact, it's not possible to easily measure rotor thickness with a caliper, this because the rotors usually have a ridge around the outer edge, and a caliper would measure from the widest point (the ridge), not from the worn surface of the rotor.

It could be done, I suppose, if one used shims (for example, coins) on either side of the worn surface when taking the measurement, and then measured the shim thickness and deducted it from the gross measurement.

A micrometer such as the one illustrated in your post would be the preferred tool, but micrometers tend to be expensive devices not commonly found in home toolkits. A caliper such as the one I used to measure the coins in post 17 above is less expensive and all around more useful to have. But, it would require that shims be used if someone wanted to measure the thickness worn surface of a brake rotor.

FWIW, I have a micrometer - but only because one was passed down to me by my father-in-law when he retired from his work as a machinist.

Michael

They use to be expensive, but that is no longer the case.

I used a one inch block gauge to check this one and it was spot on:

https://www.amazon.com/gp/product/B0045VKF5K/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

 

[The Cheese]

Back to the rotors. EBC makes full floating replacements. Had them on my last bike. Place I bought them is outta business I think.

I looked online a few minutes. Seems price has increased on them. By a lot. I'll see if I can find where I bought them, and what I paid.