Aftermarket Wheel Shootout feat. BST Wheels by PS Magazine

Aftermarket Wheel Shootout feat. BST Wheels by PS Magazine

(Translated from the original German “PS Das Sport-Motorrad Magazin” publication dated 09.19.2012)

Lighter wheels yes or no? The wonder most experienced driver. What do they bring? Do they improve the handling? Is it worth the investment? Are there any disadvantages at all? Here are the answers. Are there any disadvantages at all? Here are the answers. In this article: BMW S1000RR

Accessories wheels of seven manufacturers were tested on the BMW S1000RR)

 

Aftermarket Wheel Comparison Test

A few years ago the motorcycle world was still pleasantly simple. Cast series wheels weighed heavy as lead, and who wanted to improve the handling of his sweetheart, treated himself to a wheel set from the after-market. However, thanks to modern production technology to shrink the wall thicknesses of Erstausrüstungsrädern, the weight difference to forged and thus expensive material falls ever lower. “In the pure weight it is not at all”, called after the alarmed accessories industry dwindling clientele. “It is important, where it sits.” Pure sales strategy or tangible facts? We wanted to find out and ordered wheels of different materials all well-known accessory manufacturer, to compare them with serial counterparts. As a test machine we chose the BMW S 1000 RR. For them, every manufacturer / importer had wheels in stock or they could purchase it shortly. The results of this test are only partially transferable to other bikes. Different series wheels, a different suspension geometry and balance do not allow absolute comparison. Trends provides the test but all.

Who’s with me?
Also on board are seven manufacturers: BST, Dymag (both with carbon wheels), Galespeed, Marchesini, OZ, PVM (all forged aluminum) and RotoBox (Carbon). However, most companies offer even more light rims in the program. This applies to both the dimensions and the intended use (racing, highway), for design or material. Tip: surf over to the website of the manufacturer and get an overview over the offer. OZ and PVM sent racing models with “full-floater rotors”. These fully floating discs the same in extreme conditions (racing) the expansion and contraction of the discs better and thus prevent warping them. Drawback: The storage wears out faster, the wheels need to be replaced sooner. Fit to all the other wheels (semi-floating) series or adapted accordingly accessory discs.

What to come?
First and foremost, it is on mass moment of inertia (MOI). The abbreviation comes from English and means “Momentum Of Inertia”. The unit is specified in kg.cm ². MOI determines the resistance of a body, which is driven in rotation or braked thereof. The more the mass from the rotation axis is located (in this case axle), the higher the MOI. What does this mean for bikes? This physical condition has a direct impact on handling. Wheels with low MOI improve the manageability and vice versa. The accessory industry is therefore correct in saying that it came to the distribution of mass on. A little experiment illustrates this sample side, we packed up exactly 620 g of additional weight directly to the hub of a roughly three-pound front wheel. Without this weight, the mass moment of inertia was 858 kg.cm ², with weight 861 kg.cm ². The MOI was therefore only 0.35 percent higher, although the total mass by approximately 20 percent increased! The technical specifications of the wheels and more information are available in the respective boxes.

 

The “Auditor Inertia Chronograph” determines the mass moment of inertia (MOI) to two decimal places

What was noticeable?
Gratifying: All wheels are very well shimmed and fit perfectly into the bike. The discs run centrally in the calipers, also agrees the chain alignment. For this, the spacer sleeves are firmly connected to the wheel. The annoying “Klong” falling out sockets when wheel installation is not necessary. Less satisfactory: the case of two manufacturers (Dymag, RotoBox) fell spacer bushings at the rear of minimal too tight. The axle did not fit through the guide, the bushings had to be sharpened a bit. RotoBox surprised also with small air bubbles in the clear coat. In addition, two screws Kettenradbefestigung were so steadfast that they could not even solve the impact wrench. The same applies to the fitting of the front brake discs with PVM.

And while driving?
The good news: All the wheels improve the handling of the BMW felt. In this respect, the carbon parts of Dymag and RotoBox are at the forefront. Suffice Low steering impulses, is already working the S 1000 RR readily into the corners. However, the light wheels also pay tribute. In the ultra-fast Parabolic curve of the Hockenheim circuit course the load begins to oscillate significantly. In extreme cases, this means that gas to! Obviously a bike requires certain stabilizing gyroscopic forces to quietly draw his path. “Our wheels require a different chassis set-up, especially more compression damping,” says Dymag importer Norbert Backes. “Easy to install and get started rarely works.”

The favorite discipline of PS: driving tests on the Run. A total of eight sets of wheels went through the test

Road use permits?
A sensitive issue is the approval. According to a final judgment of the Administrative Court of Baden-Württemberg (Az 10 S 1857/09) will invalidate the approval of a vehicle only if a hazard anticipation of the change starts. In fact, so the manufacturers designed for public roads of wheels must be admitted without a trial for the road. Condition: The wheels must have the same dimensions as the stock hardware. Unfortunately, this has not yet spread among all the investigators of the relevant organizations (TÜV, DEKRA, GTÜ), anger is therefore not excluded. Playing it safe is, who gets an ABE by the manufacturer. But it is not necessary, at least in theory.

How We Tested PS

As a control tire for the test of Continental Race Attack Comp served. Endurance

Mass moment of inertia 25 points:
After a fixed point we distribute key counters for the moment of inertia (MOI). A true theoretical, yet important value. Because the lower the MOI fails, the closer the mass is at the wheel axle, which improves handling. The great art when Räderbau is to construct rims with low MOI and still high stability. driving test 50 points: For important criterion we awarded 50 out of a maximum possible 100 points. How much force is needed for the pilot steering into the corners? How easy it is to maneuver through curves change the bike? If it remains on track, or it tends to understeer (“Running-wide”)? The driving stability plays a major role. Ballert the CART quiet around the radii or rocks it on in fast corners? Although some test candidates scored points with excellent handling, but were springs in the stability. We always drove with the same amount of gasoline. handling / processing 25 points: For processing one example, the imbalance of the wheels that we have measured, of course, without a valve. Even paint, screw, fit and general finish one of them. When it comes to handling, we ensure, inter alia, fixed spacers.


BMW S1000RR OEM

Contact: BMW Authorized Dealer / www.bmw-motorrad.de

Price per set (without wheels): 1218 EUR ($1656.85 USD)

Material: Cast Aluminum

Weight in kilograms: Front 7.29 / Rear 8.95 (complete with washers)

MOI in kg x cm ²: Front 1675 / Rear 1616 (complete with washers)

Static wheel load in kg: Front 180 / Rear 270

Original brake discs used: Yes

Unbalance in grams: Front 7 / Rear 25

 

Evaluation criteria Maximum score Points
Mass moment of inertia 25 12
Driving Test 50 38
Processing / handling 25 18
Total points 100 68

Conclusion
With the heavy series wheels angles, the BMW clearly from the bulkiest. The finish goes for cast mass-produced in order, but the forged competition works fine. The sprocket carrier hangs loosely between the jerk dampers and can fall out when changing a wheel – point deduction in handling. The biggest advantage is the price.

Judgment
Satisfactory to sufficient

 


BST Black Diamond (PS Test winner)

Contact: BST Europe, 5342 PZ Oss, The Netherlands, Tel 0031/412 693 577 / www.europemotoparts.com

Price per set (without wheels): 2926 EUR ($3975.26 USD – for updated pricing click here)

Material: Carbon Fiber

Weight in kilograms: Front 6.99 / Rear 6.35 (complete with washers)

MOI in kg x cm ²: Front 1220 / Rear 893 (complete with washers)

Static wheel load in kg: Front 150 / Rear 250

Original brake discs used: Yes

Unbalance in grams: Front 15 / Rear 30

 

Evaluation criteria Maximum score Points
Mass moment of inertia 25 23
Driving Test 50 43
Processing / handling 25 21
Total points 100 87

Conclusion
Despite low MOI zirkelt the BMW not light-footed around the radii than with the metallic noble competition. Apparently, the relatively high weight of the front wheel still affects on handling. The price is significantly higher than that of the forged wheels, a case for lovers. Except for a significant imbalance in both the BST wheels are top handles. Test victory!

Judgment
Very good to good


Dymag CA5

 

Contact: Norbert Backes, 47506 Neukirchen, Tel 02157/872 454 / www.carbon.de

 

Price per set (without wheels): 2900 EUR ($3939.94 USD)

Material: Carbon Fiber

Weight in kilograms: Front 5.72 / Rear 5.82 (complete with washers)

MOI in kg x cm ²: Front 1180 / Rear 807 (complete with washers)

Static wheel load in kg: Front 185 / Rear 270

Original brake discs used: Yes

Unbalance in grams: Front <5 / Rear 25

 

Evaluation criteria Maximum score Points
Mass moment of inertia 25 24
Driving Test 50 35
Processing / handling 25 18
Total points 100 77

Conclusion
Second Lowest Moment of inertia of the test. In this round Lingen, the BMW works by itself from without being nervous – great! However, the bike rocks in the Parabolic curve on strong, apparently missing stabilizing gyroscopic forces. Deduction in processing due to close distance bushes and imbalance. Wheels for Setup professionals!

Judgment
satisfactory to good


Galespeed Type S

Contact: Gilles Tooling, L-6868 Luxembourg, 0035/2267893-1 / www.gillestooling.com

Price per set (without wheels): 2499 EUR ($3395.14 USD)

Material: Forged Aluminum

Weight in kilograms: Front 6.85 / Rear 7.57 (complete with washers)

MOI in kg x cm ²: Front 1505 / Rear 1367 (complete with washers)

Static wheel load in kg: Front 190 / Rear 280

Original brake discs used: Yes

Unbalance in grams: Front <5 / Rear <5

 

Evaluation criteria Maximum score Points
Mass moment of inertia 25 16
Driving Test 50 43
Processing / handling 25 23
Total points 100 82

Conclusion
The pretty multi-spoke wheels shine with a top processing. And despite the relatively high weight and MOI plowing the S 1000 RR as nimbly around the runway as the handiest forging competition. Only the lightest carbon wheels are handy. Apparently, the design is perfect sophisticated. With the BMW rims harmonize excellently.

Judgment
Good

 


 

Marchesini Genesi M7RS

Contact: Hostettler, 79379 Müllheim, Tel 07631/18040 / www.hostettler.de

Price per set (without wheels): 2398 EUR ($3257.92 USD)

Material: Forged Aluminum

Weight in kilograms: Front 6.91 / Rear 7.08 (complete with washers)

MOI in kg x cm ²: Front 1465 / Rear 1210 (complete with washers)

Static wheel load in kg: Front 185 / Rear 280

Original brake discs used: Yes

Unbalance in grams: Front <5 / Rear 0

 

Evaluation criteria Maximum score Points
Mass moment of inertia 25 18
Driving Test 50 41
Processing / handling 25 23
Total points 100 82

Conclusion
On the Marchesini swirls the BMW a bit unwieldy around the course than on the wheels of Galespeed or PVM. But the difference is marginal. The prima processed wheels give nowhere a shame. On the contrary, the only wheel of the test, the rear wheel has zero balance! Even the price is okay, with the Italians cannot go wrong.

Judgment
Good

 


 

Oz Piega R

Contact: Alpha Racing, 83071 Stephan churches, Tel 08036/303101 / www.alpharacing.com

Price per set (without wheels): 2297 EUR ($3120.70 USD)

Material: Forged Aluminum

Weight in kilograms: Front 6.64 / Rear 6.38 (complete with washers)

MOI in kg x cm ²: Front 1415 / Rear 1153 (complete with washers)

Static wheel load in kg: Front k. A / Rear k. A

Original brake discs used: No

Unbalance in grams: Front <5 / Rear <5

 

Evaluation criteria Maximum score Points
Mass moment of inertia 25 19
Driving Test 50 41
Processing / handling 25 23
Total points 100 83

 

Conclusion
For the also built in Italy OZ rims from the same applies as for the Marchesini’s extremely processed, very passable handling, and with around 2,300 euros, the wheels are once again a hundred cheaper. That they are one point ahead of their country sisters, they owe their slightly lower mass moment of inertia. Result: number two!

Judgment
Good

 


 

PVM 6-Speichen Racing

Contact: PVM Vetterolf, 68199 Mannheim, Tel 0621/853 172 / www.pvm.de

Price per set (without wheels): 3100 EUR ($4211.66 USD) complete with discs, manufacturer’s only all-inclusive price

Material: Forged Aluminum

Weight in kilograms: Front 6.7 / Rear 6.46 (complete with washers)

MOI in kg x cm ²: Front 1344 / Rear 1063 (complete with washers)

Static wheel load in kg: Front 200 / Rear 300

Original brake discs used: No

Unbalance in grams: Front 5 / Rear 5

 

Evaluation criteria Maximum score Points
Mass moment of inertia 25 20
Driving Test 50 43
Processing / handling 25 19
Total points 100 82

Conclusion
Lowest Moment of inertia of all metallic wheels and an excellent handling speak for the PVM-pairing. A small weakness but they afford in mounting the front brake discs: cheap-looking screws that were apparently glued firmly. Without this (avoidable) taint the PVM were ranked number two.

Judgment
Good

 


 

Rotobox RBX1 0FA/ORA

Contact: Zupin moto, 83301 Traunreut, Tel 08669/8480 / www.zupin.de

PLEASE NOTE: The RBX1 wheel used in these tests has been replaced by the newly designed RBX2, now offered and endorsed by Brock’s Performance. Please click here for more info: Rotobox Product Page

 

Price per set (without wheels): 3522 EUR ($4784.99 USD) complete with discs, manufacturer’s only all-inclusive price

Material: Carbon Fiber

Weight in kilograms: Front 5.73 / Rear 5.50 (complete with washers)

MOI in kg x cm ²: Front 1148 / Rear 723 (complete with washers)

Static wheel load in kg: Front 150 / Rear 250

Original brake discs used: Yes

Unbalance in grams: Front 10 / Rear 10

 

Evaluation criteria Maximum score Points
Mass moment of inertia 25 25
Driving Test 50 35
Processing / handling 25 14
Total points 100 74

Conclusion
The lightest wheels with the lowest MOI land far behind. The driving behavior is similar to that of Dymags: Ultra Handy, but oscillates in the Parabolic and stirs the BMW quite pronounced. It accompanies the Slovenian wheels open to attack for the finish: passungenaue distance bush, air bubbles in the clear coat, too tight of chain wheel.

Judgment
Satisfactory

 


PS Judgement

Conclusion:
First the good news: All of your accessories wheels pirouettes, the BMW S 1000 RR much handier to the slopes than with the series counterparts. The bad: The pairing that combines a perfect handling and high directional stability, there is not. BST wins this comparison because the wheels diligently score in each criterion. This is followed by a strong and equal rank midfield. The rims of Dymag and RotoBox make the BMW although very handy, but require a delicate hand with the suspension setup.

The orange bars show the mass, the gray mass moment of inertia. Based on percentage comparison are the standard wheels with 100%. To the front of BST does have 95% of the mass of the series, but only 73% of the MOI. Episode: super mass distribution