Quad

Sfera

Sfera

The Sfera wheels are perfect for the execution of circles.

From the acquisition of the historic Italian company Boiani, here is the Made in Roll-Line version of the famous Star wheels.
The compound of these wheels faithfully follows that used in Star wheels, guaranteeing the same performance.
The slightly grooved surface makes the Sfera extremely silent during the counter turns.
The wide profile is specifically designed for the execution of circles.
The 63mm diameter is optimal for the maximization of roll.
Available in 5 hardnesses (colors)
47=CS40 / 49=HD70 / 53=HD75 / 57=HD80 / 60=HD84
Available in sets of 8 wheels (It is at the discretion of each reseller to sell units in smaller quantities).

Roll-Line does not sell directly to the public; to complete your purchase, please refer to an official reseller.

Diameter	63 mm
Profile	32 mm
Hardness	47 / 49 / 53 / 57 / 60 Shore D
Floor	See Table

Indications for use

Each wheel hardness has been designed to adapt to a type of surface based on smoothness or roughness.
In general:

The softer the wheel (or the lower the “Shore” hardness number), the greater the grip and the slightly lower the smoothness.
The harder the wheel, (or the greater the “Shore” hardness number), the greater the smoothness and slightly less grip.

The following table shows the type of surface suggested for each wheel hardness.

SFERA 47	SFERA 49	SFERA 53	SFERA 57	SFERA 60
CS40	HD70	HD75	HD80	HD84
Very slippery surfaces	Slippery surfaces	Medium surfaces	Adherent surfaces	Rough surfaces

Each color corresponds to a specific hardness (as shown in the table): 47 blue, 49 grey, 53 green, 57 cream, 60 white.

WARNING: Factors such as humidity, dust, etc. can affect the seal of the surfaces.
For this reason it is preferable to have a variety of different types of wheels depending on where the training and competitions take place.
Changing the wheels does not require an adjustment period, but it is necessary to ensure that the wheels have a similar state of wear with respect to one another when equipped. To determine how to mix different types of wheels, please see the appropriate guide.

For more info on how to change wheels, please watch the video tutorial.

Control and maintenance

It is advised to verify the condition of your equipment at every use.
In particular, it is advised to check:

the state of wear of the wheels
the secure closure of the lock nuts on the wheels
the proper roll of the bearings

It is advisable to periodically clean the wheels, taking care to:

remove the bearings
remove the dust with a rag
wash the wheels with water and a light, neutral soap
avoid harsh products such as alcohols, gasoline, etc.

Periodic replacement

It is recommended to substitute the wheels in a timely manner, to guarantee the optimal performance of the equipment.
Substitute the wheels once the edges are rounded to a cone-like shape, as indicated in the following graphic: