R1200RS + R1250RS Forum
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Tue Nov 26, 2024 5:03 am
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When I traded my 2013 S1000RR (which had cast wheels) for a 2014 HP4 (forged wheels), the difference in turning was remarkable. The 1250 RS can be a bit heavy-steering and it got me thinking - would lightweight forged wheels be worth the cost, or just wasting money for a perceived improvement that only would make sense on a sport bike? And would it perhaps be detrimental...like putting ballet slippers on a Clydesdale horse? |
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I never understood the desire to mod from factory equipment unless one really uses the bike for a specific purpose (i.e., turning a sport bike into a track bike). I suppose if you enjoy aggressive riding and the bike you chose was more for fit and comfort but isn’t optimized for how you like to ride, it’s worth it.
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Zitat von zer0netgain im Beitrag #2 I am of a similar mind. I have made a few ergonomic tweaks and fitted a power socket up front. This is @BEARR though. My armchair psychologist has recognised this pondering about modifications as a winter coping mechanism to substitute riding. It keeps the connection active with the winter garage ornament. The relatively slow steering of the RS is all to do with the chassis design with a long wheelbase. See point 8 here: https://www.bennetts.co.uk/bikesocial/re...review-part-six Zitat
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Wheel weight is unsprung weight which will impact suspension response. As to whether wheel weight will impact steering response, that would depend on the mass moment of inertia of the wheel and tire. If the wheel weight savings (1~1.5-lbs) was all at the rim, perhaps. But that impact would only be at initial input to the countersteer movement when the rider is attempting to rapidly torque the front forks.
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OK...that's the response I needed to put this thread to bed. |
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Zitat von BEARR im Beitrag #5 Yes, we all get through winter in different ways. Ours seem to be wetter and windier which has meant fewer winter rides. I can cope with cold, dry roads but wet ones covered in rotting leaves are no fun. My coping strategy is looking for places to visit on trips into mainland Europe. Hours looking at roads and sites Streetview. May is the next one, on a ferry to Santander, Spain. As well as Spain, Portugal and France are easy to reach. So many options.
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Zitat von BEARR im Beitrag #1 A friend has owned several K1300S bikes and the last one had a package that included forged wheels. He said the handling difference was noticeable. He probably would not have purchased forged wheels but he really likes that his model came with them. 20220727_085250.jpg - Bild entfernt (keine Rechte) Lee |
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I had a test ride on 1200r before getting the rs, they are definitely quicker steering, I reckon if you get a set of fork lowers from an r, they will slip straight on. |
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Lighter wheels reduce the gyroscopic effect and are more easily moved from their plane of rotation resulting in quicker response in addition to less unsprung weight. Both are good things up to a point.
2023 R1250RS- 9,000 mi. 1yr., 2003 R1100S Boxer Cup Replika #6/200, 1985 K100/1100RS- 331,000 mi. 38 yrs., 2017 R1200RS- 51,070 mi, 5 yrs, (gone), 2016 R1200RS- 28,322 mi. 18 mo. (gone), 2011 R1200RT- 30,000 mi. 2 yr. (gone), 2005 R1200ST- 58,000 mi. 8 yr. 3rd deer killed it, 1999 R1100S- 15,000 mi. 2 yr. (gone), 1996 Ducati 900SS/SP- 89,000 mi. 12 yr. (gone), 500,000+ BMW miles
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Zitat von Duckbubbles im Beitrag #9 It depends on the distribution of the mass in the wheel and its relative contribution to that of the wheel-tire assembly. And, that change, only impacts during the acceleration/deceleration phase of any movement. The gyroscopic effect is too slow and weak to really impact bicycle or MC dynamics.
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Zitat von Mr. 36654 im Beitrag #10 I respectfully disagree. You can feel the gyroscopic effect while holding the axle and spinning a wheel by hand- easier to do with a bicycle wheel. Frank
2023 R1250RS- 9,000 mi. 1yr., 2003 R1100S Boxer Cup Replika #6/200, 1985 K100/1100RS- 331,000 mi. 38 yrs., 2017 R1200RS- 51,070 mi, 5 yrs, (gone), 2016 R1200RS- 28,322 mi. 18 mo. (gone), 2011 R1200RT- 30,000 mi. 2 yr. (gone), 2005 R1200ST- 58,000 mi. 8 yr. 3rd deer killed it, 1999 R1100S- 15,000 mi. 2 yr. (gone), 1996 Ducati 900SS/SP- 89,000 mi. 12 yr. (gone), 500,000+ BMW miles
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Zitat von Duckbubbles im Beitrag #11Zitat von Mr. 36654 im Beitrag #10 But, that effect has no or minimal impact on the control or stability of a Bicycle or MC. A group of grad students at Cornell configured a bicycle with counter rotating disks at the wheels to balance the gyroscopic effects. There was minimal impact relative to a conventional bike. It's a force. We all saw the demo in High School Physics. But, it's not a significant factor in the control or stability of a two wheeler.
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For what it's worth (and to keep this from becoming an ongoing discussion of the physics of rotating objects), I've decided the benefit, if any, of forged wheels isn't worth the money it would take to purchase and install them. |
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Zitat von BEARR im Beitrag #13 I thought about mentioning this but decided to let you work it out for yourself. You are getting better at this rationalisation thing, young grasshopper.
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Zitat von wessie im Beitrag #14Zitat von BEARR im Beitrag #13 What goes around, comes around... I like that "young" adjective, being nearly 78. |
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