Sram Omnium-17 - Bielas para bicicleta carretera
|Precio recomendado:||EUR 226,00|
|Precio:||EUR 202,28 Elige envíos GRATIS más rápidos con Amazon Premium o elige envío GRATIS en 4-5 días|
|Ahorras:||EUR 23,72 (10%)|
|Precio final del producto|
- El diseño del GXP Gutter Seal reduce la fricción y mejora el peso tanto en tacto como en rendimiento. Material: 7050 aluminio
- Platos: AL 7075-T6
- Peso: 825 g
- Longitud: 165 mm
- Ratio: 48
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Descripción del producto
Las bielas SRAM Omnium son la elección de los puristas de la calle y del rendimiento en la pista. Omnium son las primeras bielas de cojinete externo en el mundo. Diseñado para las carreras de pista mundiales, es el último juego de bielas "fixie" de SRAM en el mercado. Están fabricadas con una aleación de aluminio que las hace más fuerte y rígidas. Los 5 mm de espesor del conjunto de platos 7075-T6 completo fue desarrollado tan solo con cadenas 1/2 x 1/8. La manivela más dura que jamás se ha montado.
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These cranks are the stiffest track cranks I've used. Stiffer than a Sugino 75 to Phil Wood bottom bracket (my current setup). It's subtle, but if you're putting in the watts and paying attention you'll notice. To some extent, this is because of the stiffness of the crank arms themselves.
With cheap $50 cranks, you can even use your hands to feel a bit of flex in the arms. Most riders won't notice or care about this, but when you're trying to push up hill or sprint, you'll feel this. The Sugino RD2 is a noticeable improvement over these cranks, and the NJS league of cranks (Sugino 75, Dura-Ace, etc.) is an improvement over the RD2s, though less perceptible. It's a diminishing return here for sure.
At some point, what I think makes a bigger difference, is the axle/BB the cranks use. I was using a basic Shimano UN54 ($20) bottom bracket on all my square tapered cranks. When I upgraded to a Phil Wood, with it's slighter larger 17mm and stiffer (claimed) spindle, there was a noticeable improvement (more pronounced than moving from the RD2s to the Sugino 75s). The Omniums use both larger bearings and a substantially larger axle (24mm) with the GXP system. The larger axle is stiffer and the larger bearings can take heavier loads, so the performance improves substantially and is noticeable. Because the axle is integrated and hollow, it even saves some weight. Following this same trend, I found the even larger 30mm axle of the BB30 system to be even stiffer along with a narrower Q-factor afforded by the larger BB shell + bearings mounted inside the frame. I'm still waiting for BB30 track cranks to hit the market.
This is where I find the GXP system to fail next to sealed bearing systems. Myself and multiple other couriers had exactly the same problem with our Omniums, the GXP BB would wear out within 3-5 months (3000-5000mi). Closer to 3000 during our harsh winters, but still 5000 over summer months. The only logic I have is that the external bearings are just that, external, slightly more exposed to the elements and thus more subject to that kind of wear and tear. I've heard splurging for a Chris King or other high end BBs can help address this problem, but still no where close to the durability of even a basic $20 Shimano BB which some of us have ridden for 3+ years without a problem. I'll also add, I've now seen two Omniums that actually broke at the crank arm (the crank arm snapped in half). I wasn't the rider, so I don't know how it happened. It's certainly a rarity, and SRAM to my knowledge made good on warranties for those people, but it's mildly concerning.
PRICE TO PERFORMANCE (4/5)
This is where Omniums shine strong again, at least at the start. When you can get an Omnium with chainring and a GXP BB for $200, you're getting a high performance crank for much less than the rival options. In contrast, my Sugino 75 + ring + Phil Wood BB totaled closer to $400. The reason I made this plunge though is because in one year of using Omniums, I had to replace my BB three times at $40 a pop each time. If that trend continued, in three years I'd have dropped $360 on bottom brackets alone (GXP bearings are not replaceable to my knowledge - someone please correct me if they know otherwise!). This might only be a real issue for me because of the mileage these cranks were enduring under all weather conditions. If you're putting in less miles and riding in better weather, this GXP issue may not be a concern.
Of course, all these high end options (Omnium, S75, Dura-Ace, etc.) are overkill for most commuter/street uses. I disagree with some others — you can stop just fine with a cheaper crank. They'll hold up just fine and most people won't notice much of a difference. I certainly didn't until riding a bike was my job and I was doing the mileage and needed to sprint places at 35+kph uphill. Omniums are a solid buy performance wise, but if your goal is lower maintenance and reliability in the same price range, I'd consider something like the Sugino Messenger with a mid-range BB.
The SRAM cranks are stiff and the black color is non-flakey and a heavy paint coating. The Omnium install is simple and the parts are of quality; except for the plastic pieces. The Omnium's are a superior crank to complete your quality build and extremely easy to maintain. OMNIUM STIFF STIFF STIFF STIFF!
If you are looking for a quality track crank look no further than SRAM Omnium cranks, you will be riding on them for years!
BIG THANKS TO BELL'S BIKES (PA)
Moving on to street use. A lot of people have complained about the bottom bracket seals wearing quickly or there being excess drag. My experience has been very positive in that regard. I'm running the updated gutter seal design and over the course of 1 year have cleaned/re-greased the outside of the bearings once which took all of 1 minute. The bearings themselves are not really replaceable but that's okay since you can get a new bottom bracket for $30 and install it with one tool in about 1 minute. I have not had to replace mine yet and I ride in rain, snow, and salted streets. There are no rounding off issues like with square taper bb's and nobody denies that these are stiffer. The arms are made of the highest grade aluminum and take to bike rack rails with abandon.
The negatives: The finish is a bit poor in black. Mine has warn a good amount on the drive side from road use. There is more drag when spinning these than a set of Sugino 75's but just like ceramic bottom brackets and 4k tv's nobody cares or notices when, you know, actually riding their bike.
The arms install easy enough but if you're not careful it's pretty easy to snap the non drive side arm screw. I did just that after a couple years of use.