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Comparison VNC RockRider A7 27.5 2019 vs VNC FastRider A7 29 2019

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VNC RockRider A7 27.5 2019
VNC FastRider A7 29 2019
VNC RockRider A7 27.5 2019VNC FastRider A7 29 2019
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Model year20192019
Type
mountain (MTB)
mountain (MTB)
Frame and suspension
Frame size4753
Frame materialaluminiumaluminium
Suspensionhardtailhardtail
Suspension type (fork)
spring-elastomer /SR Suntour XCT/
spring-elastomer /SR Suntour XCT/
Fork travel100 mm100 mm
Wheels and brakes
Wheel size27.5 "29 "
Rim materialaluminiumaluminium
Rimdouble walldouble wall
Front brake
hydraulic disc /Shimano M315, 160mm rotor/
hydraulic disc /Shimano M315, 160mm rotor/
Rear brake
hydraulic disc /Shimano M315, 160mm rotor/
hydraulic disc /Shimano M315, 160mm rotor/
Front hub modelQuando KT-K68FQuando KT-K68F
Rear hub modelQuando KT-K68RQuando KT-68R
Handlebar and transmission
Speeds2424
Chainrings
/Prowheel MC-AD26 42-34-24T/
/Prowheel MC-AD26 42-34-24T/
Freewheel cogs88
Freewheel/cassette modelShimano HG31Shimano Acera HG31
Front derailleurShimano Altus M310Shimano Altus M310
Rear derailleurShimano Acera M360Shimano Acera M360
Shifter typetriggertrigger
Shifter modelShimano EF505Shimano EF505
Chain modelKMC Z8KMC Z8
Handlebar typestraightstraight
General
Equipment
chain guard
chain guard
Color
Added to E-Catalogaugust 2019august 2019

Frame size

Frame size refers to the distance from the saddle attachment point to the bottom bracket attachment point (axles with gears and pedals). The main parameters that determine the choice of a bike for frame size are the height of the user, the purpose of the bike and the intended riding style.It is also worth considering the female frame, which is lowered, which allows you to ride comfortably even in a skirt or dress.

User height is the most significant factor. In general, the taller the user, the larger the frame should be. The universal formula that allows you to calculate a specific size is as follows: the length of the leg from the groin to the heel in centimeters must be multiplied by 0.6, and then divided by 2.5 — you get the approximate size of the frame in inches. But in the characteristics of brands, the frame can also be indicated in the usual form for measuring size XXS, XS, S, M, L, XL and XXL.

However, note that this value is very arbitrary and approximate, it can only be used for simple bicycles not intended for extreme driving (for example, city bikes, see "Destination"). If you choose a more specialized model (mountain, road, BMX) — it is better to refer to the tables for th...e appropriate type, because. sizes for one height can vary significantly depending on the destination. In addition, different manufacturers have different frame geometry and measurement methods, and therefore, for the most accurate selection, it is recommended to use the manufacturers' own tables.

Note that the optimal frame size is not absolute — in most cases, for the same height, “neighboring” sizes are quite suitable. And here it is worth paying attention to the intended driving style. It is believed that small, well-controlled frames are better suited for extreme variant, and larger and more stable ones are better suited for long-term calm movement.

Wheel size

The nominal diameter of the bicycle wheels. Usually, this paragraph actually indicates the size of the bicycle tyres supplied in the kit, more precisely, the outer diameter of the tyres.

Wheel diameter is traditionally indicated in inches. For bicycles of different purposes and age groups (see paragraphs above), there are certain size standards. So, adult mountain models are equipped mainly with 26 " wheels, "road" and urban ones — with a slightly larger diameter (mostly 28 "), and BMX for the most part — much smaller; children's and teens' bikes have smaller wheels than similar adults' bikes.

Other things being equal, larger tyres hold speed better and work out small bumps on the road; and relatively small wheels are more “sticky”, they provide more torque and better traction. This is the reason for the above-described difference in wheel sizes between bicycles for different purposes. Such nuances will be useful if you choose a car from several models with similar characteristics, but different wheel diameters. Here it is worth considering the features of the planned application. For example, for urban and "road" driving — on a hard surface without any special irregularities and elevation changes — it is better to choose larger wheels, and for dirt roads with ups and downs — smaller ones.

Also note that tyres are replaceable, and many bikes allow the installation of tyres of...a “non-native” size — for example, 29 "on a model with 28-inch wheels. It is also worth considering that wheels (tyres) of the same size may differ in inner (landing) diameter These nuances are described in detail in special sources.

Rear hub model

Model of the hub used in the rear wheel of a bicycle. See Front Hub Model for details.

Freewheel/cassette model

Model of a cassette — a system of rear wheel gears — mounted on a bicycle. Cassettes of different models differ in characteristics and can belong to different classes — from entry-level to professional. Knowing the cassette model, you can get acquainted with its features in more detail (according to official documentation, reviews, user reviews, etc.). This is especially important when choosing a bike for professional cycling.