Shimano R650 Dual Pivot 57mm Drop Brake Caliper
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Aimed at the serious road cyclist who wants dependable performance, R650 callipers are hard to beat.
Top Features of the Shimano R650 Dual Pivot 57mm Drop Brake Caliper
- 57mm drop compact dual pivot design allows for superior braking performance without sacrificing weight
- Brake shoe replacement and adjustment is easy with the cartridge shoe holders
- Toe in adjustable brake shoes
- Made from cold forged aluminium and anodised in a silver finish
- Low friction performance is assured thanks to the coated pivot washers and thrust bearings
- Alloy Q/R thumb lever for easy wheel removal
About Rim Brakes
Rim brakes for bikes use the sidewall of the rim to reduce speed, this is done by a pad on either side applying friction against the rim, which reduces your momentum. Road brake callipers have been redesigned over the years and now use a system called 'dual pivot' which means the brake arms pivot off centre to apply a higher amount of pressure on the rim to increase your stopping power. Most manufacturers use dual pivot callipers on the front and rear, but some Campagnolo brakes use a traditional single pivot on the rear to 'balance' the braking power, the logic behind this is that as you brake your weight shifts on to the front of the bike and as much as 75% of the braking force is applied to the front.
About the Shimano brand
Shimano are the makers of the world's most well known cycle component brand. Established in 1921 when the first cycle freewheel was forged. Shimano produce drivetrains, wheels, pedals, shoes, cycling clothing and pretty much every Shimano cycle accessory you can think of! Famous for their top end products ridden by the pro's, Dura-Ace and XTR, which cover both road and MTB's. At Shimano, they're doing everything they can to respond to heightened environmental concerns. Shimano are proud to be a producer of bicycle components that help people to enjoy outdoor sports and interact with nature through healthy non-polluting activities. In their 87 plus years of existence Shimano have accumulated a wealth of technology and product development and expertise that serves as the driving force behind their continually evolving product line.
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Product Q & A
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Are the fittings on these the newer recessed type or the older nut fixings. They will be replacing tektro r539s with the recessed nuts.
I don't have the ceramic rims, but I ride Open Pros. I use the salmon-colored Kool Stop pad inserts, and love them. I would expect their green pads to be fine.
I assume that these are sold singularly as well?
Are these my best option?
What standard shimano spec are they equivalent too?
I don't think you'll have any trouble using these calipers with 4500 series shifters.
These calipers are equivalent to 105/Ultegra in terms of quality and stopping power.
I use these on a bike that needs long reach brakes and this bike uses 5700 series 105 levers with no issues. The Shimano tech docs list Ultegra 6600 and 105 5600 as being the recommended levers.
These brakes are Ultegra level, with longer reach arms.
They are equivalent to the Ultegra spec.
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