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Old 12-24-2012, 04:59 PM   #1 (permalink)
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Default Sprockets not the same on HP4

At least on the standard. The bolt pattern in the first pic is an aftermarket 520 sprocket off of a 2011 S1K. The second is one for Marchesini wheels from Driven. Although the second one is the same bolt pattern, the holes aren't the same. The bolts in the HP4 carrier are larger (I removed one and tried it). So we get to wait for those to come out too...
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Old 12-24-2012, 05:23 PM   #2 (permalink)
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Can you further clarify? I'm not understanding completely... it almost sounds like you are saying the bolt patterns are different on the HP4 from the standard S1. But then you compare the HP4 to a Marchesini (which could have a different carrier anyway).

I'm prolly just missing something?!
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Old 12-24-2012, 07:57 PM   #3 (permalink)
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The HP4 rear sprocket bolt pattern is not the same as the S1000RR. That's the bottom line.
The first pic shows the carrier/hub off the HP4 with a sprocket that fits the S1000RR.
The second pic shows the same HP4 rear carrier/hub with a sprocket that fits Marchesini wheels. It has the same bolt pattern/circle. However, the bolt holes on the Marchesini sprocket are too small (not the bolt pattern).
Hopefully that clarifies it.

I will also say (additionally) that the HP4 carrier/hub looks a lot like the one off my last Marchesini wheel off another bike. The cush drives are also similar between them.
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Old 12-24-2012, 09:44 PM   #4 (permalink)
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Quote:
Originally Posted by the head View Post
The HP4 rear sprocket bolt pattern is not the same as the S1000RR. That's the bottom line.
The first pic shows the carrier/hub off the HP4 with a sprocket that fits the S1000RR.
The second pic shows the same HP4 rear carrier/hub with a sprocket that fits Marchesini wheels. It has the same bolt pattern/circle. However, the bolt holes on the Marchesini sprocket are too small (not the bolt pattern).
Hopefully that clarifies it.

I will also say (additionally) that the HP4 carrier/hub looks a lot like the one off my last Marchesini wheel off another bike. The cush drives are also similar between them.
Makes me think the Wheels are Marchesini.
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Old 12-24-2012, 11:15 PM   #5 (permalink)
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Quote:
Originally Posted by Jackson View Post
Makes me think the Wheels are Marchesini.
I would agree since the HP4 has Brembo brakes and components. And Brembo owns Marchesini.
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Old 12-25-2012, 12:31 AM   #6 (permalink)
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Quote:
Originally Posted by the head View Post
At least on the standard. The bolt pattern in the first pic is an aftermarket 520 sprocket off of a 2011 S1K. The second is one for Marchesini wheels from Driven. Although the second one is the same bolt pattern, the holes aren't the same. The bolts in the HP4 carrier are larger (I removed one and tried it). So we get to wait for those to come out too...
The BMW press materials does describe the HP4 as have a new lighter sprocket carrier.

"New finely wrought 7-spoke wheels in forged light alloy and a new, lighter sprocket carrier give the HP4 a weight reduction of 2.4 kg as compared to the RR."
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Old 12-25-2012, 02:16 AM   #7 (permalink)
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The HP4 must use a M10x1.5mm studs like the S1k. Just about everything out there uses M10x1.25mm. That kind of sucks.
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Old 12-25-2012, 11:23 AM   #8 (permalink)
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Quote:
Originally Posted by M GmbH View Post
The HP4 must use a M10x1.5mm studs like the S1k. Just about everything out there uses M10x1.25mm. That kind of sucks.
1.5 vs 1.25 pitch would have no overall effect of the diameter of the fastener. The sprocket would still fit on a carrier with M10x1.25 vs M10x1.5 if the bolt pattern was the same.


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Old 12-25-2012, 12:02 PM   #9 (permalink)
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You can't put a sprocket with a 1.25 bolt hole on a 1.5mm. That's like putting a pinky ring on your thumb.

Quote:
Originally Posted by Jackson View Post
1.5 vs 1.25 pitch would have no overall effect of the diameter of the fastener. The sprocket would still fit on a carrier with M10x1.25 vs M10x1.5 if the bolt pattern was the same.


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Old 12-25-2012, 01:06 PM   #10 (permalink)
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Originally Posted by M GmbH View Post
You can't put a sprocket with a 1.25 bolt hole on a 1.5mm. That's like putting a pinky ring on your thumb.
It's all thread pitch, 1.25 means there is a thread every 1.25mm and 1.5 means there is a thread every 1.5 mm. It has nothing to do with the hole. Also the 10.9 you see stamped on the stud end indicates the grade of the fastener.
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Last edited by Jackson; 12-25-2012 at 01:15 PM. Reason: added info
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