Dymag Carbon fibre wheels - Page 2 - BMW S1000RR Forums: BMW Sportbike Forum
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post #11 of 22 (permalink) Old 12-01-2012, 12:03 PM Thread Starter
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wheel weights

Right then time for definitive information.

OEM wheels complete with all ABS rings, brake discs and Avon 3D extreme tyres, rear wheel has Renthal sprocket

Front - 10.0 Kg
Rear - 14.5 Kg

Dymag CA5 wheels

Rear complete with ABS ring, Renthal sprocket, Brembo non-floating disc and Avon 3D extreme tyre - 11.5 Kg
Front c/w twin floating Brembo HPK disc rotors, ABS ring and Avon 3D extreme tyre - 8.5 Kg

Far too cold and wet here in the UK to venture out on new tyres, it will have to wait for a dry day.

Now before anyone starts to moan about calibration etc it is the percentage reduction in weight and the momentof interia that matters.

You now have the information, any conclusions are up to you, so no need for anyone to attempt to critise as is quite often on this forum.

Safe Riding

Last edited by john S1000RR; 12-01-2012 at 12:06 PM.
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post #12 of 22 (permalink) Old 12-01-2012, 12:54 PM
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That's a nice weight loss. Any idea how it compares to that of the OZ's?
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post #13 of 22 (permalink) Old 12-01-2012, 01:53 PM Thread Starter
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wheel weight

Sorry Ghost410 no idea, I was only interested in the relative weight loss to OEM parts, obviously with any carbon fibre wheel the majority of the weight will be in the aluminium hub components and not at a long radius from the axle such as the rim, this is one of the main reasons I went for the carbon fibre over forged aluminium or magnesium alloys.

With the weight concentrated at the hub the benefits are more substantial that just a simple matter of loosing overall wheel weight.

Hence my comment on moments of inertia, although it was back in 1981 when I got my mechanical engineering qualifications I think I can still remember of little of what I was taught.

If you prefer the look of any other wheel then buy them, the feel good factor is always worth a quicker lap time.
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post #14 of 22 (permalink) Old 12-01-2012, 02:15 PM
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Good to see someone with an engineering background. I do as well and have made my living off applying it to the car racing world.

Very excited to see how you like them
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post #15 of 22 (permalink) Old 12-01-2012, 02:28 PM Thread Starter
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weather

We are due for a bad winter in the UK so I have the feeling that I wont get to really appreciate any benefits until about March next year, but I can always sit in the garage with a cup of tea (whisky laden) and plan..............
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post #16 of 22 (permalink) Old 12-01-2012, 09:05 PM
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Quote:
Originally Posted by Ghost410 View Post
That's a nice weight loss. Any idea how it compares to that of the OZ's?
The OZ Cattiva's are some of the lightest wheels out there, even lighter than the BST's...which is the reason why I bought the Cattiva forged mag's. The wheel weights, ready to mount, are:

Front OZ wheel assembly (Brembo T-Drive rotors, ABS ring, tire, etc...) - 9.95 kg
Rear OZ wheel assembly (Speigler rotor, ABS ring, cush drive, tire, etc...) - 11.29 kg

Stock wheel weights, ready to mount:

Front wheel assembly - 11.29 kg
Rear wheel assembly - 15.08 kg

Total savings: (15.08 + 11.29) kg - (9.95 + 11.29) kg = 5.13 kg

One thing to note, my wheels are a custom setup. I fabricated my own ABS ring to allow for the Brembo T-Drive rotors to fit and the ABS to work. Basically I was able to save .45 kg by going with my custom setup instead of the stock ABS ring and stock rotors. I weighed everything using a postal scale. While my stock wheel weights are a little different the the OP's, I think they are close enough to be considered legit. Possible source of difference was John had Avon tires and I had the Conti's... Hope this helps. Jason
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post #17 of 22 (permalink) Old 12-01-2012, 09:15 PM
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Quote:
Originally Posted by john S1000RR View Post
Obviously with any carbon fibre wheel the majority of the weight will be in the aluminium hub components and not at a long radius from the axle such as the rim, this is one of the main reasons I went for the carbon fibre over forged aluminium or magnesium alloys. With the weight concentrated at the hub the benefits are more substantial that just a simple matter of loosing overall wheel weight.
This is a very good point. While the OZ's has greater weight savings, the carbon wheels save the weight in the most critical area, the outer radii. I believe one of the main reasons why the OZ's are lighter is because they have a magnesium hub and not aluminum. There are other reasons as well obviously, but I think this is one major factor of the overall weight savings. Honestly I think you cannot go wrong with either setup. I love the feel of my bike after the weight savings (feels like I'm riding a 600). The other reason I went with the OZ's was not just the weight savings, but also they were $300 cheaper than the BST's if I remember correctly. So that really helped my decision. One day I would like to ride an S1000RR with carbon wheels to see if there is a significant difference.
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post #18 of 22 (permalink) Old 02-19-2013, 01:30 PM Thread Starter
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Dymag Carbon fibre wheels

Just took the bike out for its first run after fitting the Dymag cf wheels, although I was scrubbing new tyres in I could immediately notice the quicker turn in. Worth every penny


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post #19 of 22 (permalink) Old 02-27-2013, 03:39 PM Thread Starter
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Dymag Carbon fibre wheels

Had the bike out for a longer ride and am pleasantly surprised by how much the change to carbon fibre wheels has improved the bike, if anyone were to be considering the mod the I would say go for it before any other mods to suspension etc


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post #20 of 22 (permalink) Old 02-27-2013, 03:53 PM
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Originally Posted by john S1000RR View Post
if anyone were to be considering the mod the I would say go for it before any other mods to suspension etc


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Carbon fiber wheels before proper suspenders....Bad advice.
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