Jannike Campero Laser Hair Removal

Andis Speed

Lighter rollers = better acceleration, heavier rollers = higher top speed?

In the shop we are asked on an almost daily basis for lighter than standard rollers for improved acceleration or heavier rollers for higher top speed. There is widespread belief that rollers are a compromise whereby the rider can choose between higher acceleration at the expensive of some loss of top speed, or higher top speed at the expense of some acceleration. This therefore implies that there are no actually 'correct' rollers for a specific bike, and the best choice of rollers is ultimately down to user preference.

But is there actually any truth to this ?

First of all we need to consider powerbands. All engines make their maximum power at a specific rpm. The further you are away from this rpm the less power your engine is developing at that moment. As you tune an engine to develop more power the power increases but the peak power tends to occur at a higher rpm and tends to drop off much more quickly as the engine speed moves above or below this rpm, this is what's known as a narrow powerband.
A 2-stroke motocross bike is a good example of a narrow powerband engine, they normally have 6 close ratio gears to allow you to keep the bike revving highly all the time and to remain as close as possible to the rpm where all the power is developed. Because the powerband is so narrow there is virtually no power at lows revs and you have to work the bike to keep the revs within the narrow powerband all the time.

Similarly if you fit a power pipe to a ped without changing the rollers the bike at first seems slower because although the engine now has a higher power output the cost of this is that it occurs at higher revs and the powerband has narrowed. So whilst your bike might have developed enough power to happily pull away at 6500rpms with the standard pipe, the tuned and now more powerful bike with the pipe fitted actually develops less hp at 6500rpm than it did with the standard pipe and it struggles to pull away.

Because the engine only actually develops peak power at one specific rpm a geared bike or car is virtually never utilising it's peak power, it's only actually achieved for a brief moment as the revs pass through peak power rpm whilst accelerating. The best compromise for maximum *useable* power is to manage the gearing so as the engine can be kept as close as possible around this rpm for as long as possible.

Even a standard moped is actually in quite a high state of tune and already has a narrow powerband. A 1.0 litre car developing 50hp actually only develops half of the power per litre that a 50cc moped does producing 5hp.

To keep the moped within it's narrow powerband it uses a variator system. The idea is that if you know at what rpm the engine develops its maximum power, the variator system can be tuned to keep the engine at that specific rpm all the time meaning that peak power is available immediately and continuously at any time you mash the throttle.

So back on topic...
Ok, we all know that lighter rollers allow your engine to rev harder and vice versa, and that if the variator is working well it should hold the engine at a constant rpm dictated largely by the weight of the rollers.

But how does this effect top speed? It actually doesn't. Roller weight doesn't have any effect on top speed (except in unusual circumstances)

It's important to realise that the variator can only hold the rpm constant until it has adjusted itself all the way out, as soon as the road speed is reached at which the variator can no longer keep changing out the transmission becomes fixed gearing.

The printout below shows a Yamaha Aerox, pretty much standard with a Viper pipe and Polini variator fitted. The only difference between the graphs is that each run up is done with different weight rollers- 3.5g (blue line), 5g (red) and 6.5g (green).

If you look at point 'A' on each of the runs this shows the point at which the variator can no longer change the gearing (to keep the rpm constant) for each roller weight. As soon as this point is reached the gearing becomes 'fixed linear' meaning that the only way the speed can increase is if the engine rpm's are also increased in direct proportion. At line B on the printout the variator has fully changed all the way out for all the different roller weights and from this point on the engine rpm will always be the same relating to the road speed and consequently the power developed will be the same and so will the ultimate top speed.

After point B the engine rpms simply continue to increase for all examples until the power drops away as we move further and further away from peak power rpm until it no longer has enough power to accelerate further - this occurs at 60.5mph for all roller weights on our printout when the power developed by the engine has dropped to 3hp.

Having established that roller weight has no effect on top speed it becomes clear that there is only really one ideal roller weight for a specific bike when tuning for both acceleration and top speed. In a later article we'll discuss finding it and general variator tuning in more depth.

It's worth noting that the Polini variator is a vast improvement on the standard Aerox one which is particularly poor on even a mildly tuned Aerox. It's able to keep to revs constant far more uniformly meaning the engine is utilising it's available power much better and it's able to adjust out to a higher gearing than the standard one often meaning a significantly higher top speed even without a gear kit.

Note: there are special circumstances where the above information can be disputed, but it can be considered reliable for general use and road peds.

Pedparts UK

About the Author

Andy is the writer and webmaster of http://www.pedparts.co.uk a distributor of moped parts & accessories dedicated to offering excellent and reliable customer service.

Andis Agb 2 Speed Quad Clippers $219.95 Andis Agb 2 Speed Quad Clippers

Andis Upper Housing for AGC Super 2 Speed $11.99 Andis(R) Upper Housing for AGC Super 2 Speed Clipper This is the Andis(R) AGC Upper Housing for the Andis Super 2 Speed pet clippers (Item #190600). Item Specifications: Color: Burgundy

Andis Excel 2 Speed Detachable Clipper Model 22315 $130.9 Andis Excel 2 Speed Detachable Clipper Model 22315

Andis 5 Variable Speed BGRV Clipper Model 63100 $136.9 Andis 5 Variable Speed BGRV Clipper Model 63100

Andis AGC Super 2 Speed Animal Clipper Model 22360 $146.9 Andis AGC Super 2 Speed Animal Clipper Model 22360

Andis UltraEdge AGC Super 2 Speed Animal Clipper Model 22465 $146.9 Andis UltraEdge AGC Super 2 Speed Animal Clipper Model 22465

Andis AGC Super 2 Speed Small Animal Clipper $198.13 Andis AGC Super 2 Speed Small Animal Clipper. This two speed clipper from Andis is designed for super fast cutting.

Andis AGC Single Speed Clipper $144.84 Andis AGC Professional Clipper with size 10 detachable blade set with one single speed. Its features include a 2700 SPM, detachable blades for ease of changing and cleaning, a powerful rotary motor, and new contoured design.Features2700 SPM10 Detachable b

Andis Super 2 Speed Clipper $171.68 Andis Super 2-Speed Clipper FeaturesProfessional 2-speed clipper - high speed is over 4,000 strokes per minute.Extremely quiet operation.Runs so cool, fans and air vents that can become clogged with hair are not needed. ULTRAEDGE Detachable blades for e

Andis Excel 5 Speed Clipper $199.95 Ergonomic Andis design with a comfortable anti-slip, soft grip housing contoured to fit your hand. Variable, 5-speed clipping. Use lower speeds for cooler running and clipping around sensitive areas. Higher speeds for prettier coat finish and clipping body coat. The powerful rotary motor clipper is designed for complete animal grooming....ideal for the professional groomer. The lowest speed is 2500 strokes per minute with the highest being 4500. Each interval runs at 500 strokes per minute faster than the previous level. Equipped with a 4x4 blade drive with 25% more blade torque. Detachable blades for easy changing and cleaning. Includes CeramicEdge #10 blade. Uses all Andis UltraEdge, CeramicEdge, and Oster A-5 blades Brand: Andis Company Made in USA

Andis AGC Professional Clipper $193.95 Andis AGC Professional Clipper. This powerful single speed clipper from Andis was designed for professional pet grooming use.

Andis 2 Speed Detachable Clipper $189.99 Andis 2 Speed Detachable Clipper runs at up to 4,400 strokes per minute due to it's heavy duty, high speed motor. FEATURES 2 speed motor for extra power and fast smooth cutting New anti-slip soft grip housing Extremely quiet operation Up to 4,400 strokes per minute 4x4 blade drive 25% more blade torque Removable drive cap for easy maintenance Clipper comes equipped with an UltraEdgeTM #10 Blade Works with all UltraEdgeTM and CeramicEdgeTM blades (sold separately) - the largest selection in the industry Blades also compatible with Oster Model A-5 and most detachable-type clippers

Andis AGC Super 2 Speed with T 84 Blade $228.95 Andis AGC Super 2 Speed with T 84 Blade. This two speed clipper from Andis includes the extra wide T 84 blade perfect for complete horse grooming.

Andis AGC2 2-Speed Clipper $180.62 The Andis AGC Super 2 Speed Clipper delivers the precision quality results busy grooming professionals needs. Super fast with over 4000 strokes per minute this clipper can take heavy daily use. Cool quiet and maintenance free.Clipper, Andis AGC2 2-Speed #

Andis LightSpeed Animal Clipper $243.95 Andis LightSpeed Animal Clipper. The industry's first illuminating high speed animal This unique clipper features a full blade coverage 4 LED light for expert precision and safer clipping in dark shadowed areas.

Andis AGP Pro Clipper Super 2 Speed $169.99 Andis AGP Professional Pet Clippers Super 2 Speed with #10 Blade A powerful rotary motor clipper designed for heavy duty use, the Andis AGP Professional Pet Super 2 Speed Clippers are designed for normal and high speed settings. This high speed provides 25% faster cutting for animals with heavy coats. Original Andis shape with updated features such as a new anti-slip grip. The locking blade hinge keeps blades secure. *Suggested blades for Equine use: T-84, T-10, 10, 30, 40 Features: . Heavy Duty 14 foot cord . Equipped with a 4x4 blade drive . Removable drive cap for easy maintenance . Maintenance free - no oiling or greasing of internal parts . Works with all UltraEdgeTM and CeramicEdgeTM blades (sold separately) . Color - Purple Item Specifications: . Manufacturer Number: 27370 . Motor Type: Permanent Magnetic Rotary . Speed: 2-Speed . Strokes per Minute: Low 3,400/High 4,400 . Warranty: 1 Year

Andis AGRV PowerGroom 5 Speed Clipper $167.99 Andis(R) AGRV PowerGroom 5 Speed Pet Clipper The Andis(R) AGRC Power Groom 5 Speed Pet Hair Clipper is a super duty clipper that is ideal for complete animal grooming. Its 5 speed settings reduce blade heat and provide more control and clipper speed according to pet's coat thickness. Clipper features detachable blade system for easy changing and cleaning. The PowerGroom will even remember your last speed setting, even when turned off! A 360 degree tangle-free swivel cord increases mobility and reduces hand strain and cord wear. Features: Detachable blades for easy changing and cleaning Locking blade hinge keeps blades secure 25% more power Easy-to-use, touch button speed controls Remembers last speed setting even when turned off Equipped with a 4x4 blade drive with 25% more blade torque Convert to a cordless clipper by using BGRC battery pack (sold separately) 360 tangle-free swivel cord increases mobility and reduces hand strain and cord wear INCLUDES: UltraEdge #10 blade, 4oz bottle of oil Item Specifications: . Manufacturer Number: 63360 . Motor Type: Rotary Motor . Speed: 5-Speed . Strokes per Minute: 2,600-5,000 . Warranty: 1 Year

Andis Tackmate Clipper $29.99 Andis(R) Tackmate Clipper The Andis(R) Tackmate Clipper features: • High-speed, adjustable blade for all-around grooming • Powerful motor generates over 7,200 cutting strokes per minute • Balanced, ergonomic design feels smaller and lighter in your hand • Whisper-quiet, smooth running motor stays cool • Single lever adjusts clipper blade from 30-15-10 cutting lengths • Hanger loop allows for easy and convenient storing • Small bottle of oil included

Andis Clippers DAD22360 Super 2 Speed Clipper $307.86 The Andis AG2 Super 2speed clipperhas all the power you need to handle any grooming challenge. Free T10 Blade makes short work of big jobs. Detachable blades are compatible with Oster A5 blades. Leaves a luxurious finish with no scissoring needed.

Andis AGC 2 Speed Clipper w/10 Blade $144.99 Andis AGC 2 Speed Dog Clippers with #10 Blade Heavy-duty 2-speed motor gives the Andis(R) AGC 2-Speed Dog Clipper extra power while also providing a fast, smoother clipper cut. High speed is 25% faster than single speed dog clippers. This dog clipper has a lockable switch on the handpiece that allows greater control. The lightweight, ergonomic handpiece features a break-resistant nylon housing. *Suggested blades for Equine use: T-84, T-10, 10, 30, 40 FREE 4 oz. bottle of blade oil and FREE #10 Blade with purchase! Features: Quiet operation to please even the most sensitive animal Removable drive cap for easy cleaning Locking blade hinge keeps blade secure Break resistant housing material, withstands harsh chemicals Maintenance free - no oiling or greasing of internal parts is needed Detachable blades for ease of changing and cleaning Features 14' heavy duty cord Works with all UltraEdge and CeramicEdge blades (sold separately) Item Specifications: . Manufacturer Number: 22340 . Motor Type: Permanent Magnetic Rotary . Speed: 2-Speed . Strokes per Minute: Low 2,700/High 3,400 . Warranty: 1 Year

Andis AGC 2 Small Animal Clipper $207.95 Andis AGC 2 Small Animal Clipper. The Andis AGC 2 is a professional two speed clipper. Its quiet operation will please even the most sensitive animal.

Andis Quiet Aire Dryer $29.99 Andis Quiet Aire Dryer The Andis Quiet Air Dryer is quieter than traditional dryers! The Quiet Aire uses ionic technology to dry hair faster, while even-heat ceramic technology preserves natural oils and seals in moisture for a silky, healthy coat. It can be used with or without the adjustable stand for the perfect drying angle. Features: . Whisper quiet operation . Optional adjustable dryer stand . 4 heat/3 air settings for quick styling Item Specifications: Air Volume: 60 CFM Air Speed: 673 FPM Heat: 123 - 221 Degrees Fahrenheit Amps: 15 Watts: 1,875 Volts: 125

Andis Super AGR+ Cordless Clipper $342.95 The Andis Super AGR + Cordless Clipper is a powerful detachable blade clipper designed for all day, heavy use.  High speed motor with 3800 strokes per minute gets the job done safely and easily

Andis AGCL LightSpeed Clipper $156.99 Andis LightSpeed Dog Hair Clippers with #10 Blade The Grooming Industry's first illuminating clipper! Includes four ultra bright, no heat LEDs for safer, more precise clipping. Maximum LED life withstands heavy use without burnout. Eighteen times brighter for safe clipping of dark shadowed areas. Two-position switch allows for high-speed clipping with or without lights. Locking switch button - will not accidentally shut off. Quiet operation to please even the most sensitive animal. *Suggested blades for Equine use: T-84, T-10, 10, 30, 40 Features: . Heavy Duty 12 foot cord . Size 10 Detachable Blades for ease of changing and cleaning . Makes the tough areas of the body easier to see (inside legs, belly, etc.) . Great for black coats and dark coated animals . Light is able to be turned off on Low Speed . Maintenance free - no oiling or greasing of internal parts . All Andis UltraEdgeTM , CeramicEdgeTM , and Oster Model A-5 blades fit this clipper Item Specifications: . Manufacturer Number: 23175 . Motor Type: Permanent Magnetic Rotary . Speed: Variable Speed . Strokes per Minute: 4,400 . Warranty: 1 Year

Andis AGC Super 2 Speed Clipper $209.99 The Andis AGC super 2-speed dog clipper is engineered to offer a higher speed that makes your finished work exceptionally smoother with much less effort. 50% faster than single speed dog clippers and 25% faster than standard Ag 2-speed dog clippers. Professional 2-speed clipper: 3400 spm and 4400 spm Designed for super fast cutting Runs so cool, fans and air vents that can become clogged with hair are not needed Quiet operation to please even the most sensitive animal Removable drive cap for easy cleaning Locking blade hinge keeps blade secure Break resistant housing material, withstands harsh chemicals Sealed motor for cool, quiet long-life Maintenance free - no oiling or greasing of internal parts is needed Detachable blades for ease of changing and cleaning Features 14' heavy duty cord Works with all UltraEdgeTM and CeramicEdgeTM blades (sold separately) - the largest selection in the industry Blades also compatible with Oster Model A-5 and most detachabl

Andis Cordless Trimmer $14.99 Andis Cordless Trimmer This lightweight, easy to use, slim line design trimmer is excellent for trimming and light touch-ups. Use to trim around the eyes, nose and ears. Ideal to use between visits to the groomers. Not recommended for use on heavy hair. Includes: Trimmer and clipper oil. *Suggested blades for Equine use: T-84, T-10, 10, 30, 40 Features: . Battery operated makes it easy to use anywhere . Operates on two "AA" batteries (not included) Item Specifications: . Manufacturer Number: 22965 . Speed: Single . Warranty: 1 Year

Andis Profoil Pro Shaver $46.99 Andis ProFoil Professional Shaver...Cutting-edge technology for an ultra-close, ultra smooth shave; Clean up hair styles. Perfect for finishing short and close-cropped hair styles; Shave irritation free. Hypo-allergenic, micro-thin titanium foils glide over skin; Built-in slide up trimmer. Trims mustaches, sideburns and beards; Shave fast-ultra high-speed, precision cutting heads glide easily; Shave easier-machined cutters will not clog...rinse clean fast; Shave closer- enlarged foil holes enhance performance; Includes: Cleaning brush, Charging adapter.