unicycle.builders

Bearings

3805B2RS
3805B2RS

When some unicycle manufacters decided to use the ISIS standard in unicycling, they had no other choise then to use poor bearings. ISIS bearings are OK'ish for bicycle brackets (for which ISIS was designed), but are not the best suitable for use on a unicycle. Now these ISIS bearings didn't make such a significant difference to what cheap unicycles had. But myself, I was using much better bearings before, and so knew the difference they make, and therefor also knew the importance of having good bearings.

So the initial choise when designing the "Gino" unicycle frame was not 32mm, such as Impact. But -believing the theory that smaller balls easier misform- I prefer larger balls, and so rather had a larger diameter. And so the picked choise of design were these 25 × 37 × 10 rubber sealed double row angular contact ball bearings. Which simply provide an unmatched smooth spin under each possible angle and load.

Bearings with such quality come at a price, but such a unicycle deserves such a quality. But alternatively there are cheaper "Thin Section Deep Groove Ball Bearings" exist in the same size.

Details

sizing
Brand
INA
Model
3805B2RSRTVH
Seals
Rubber, double
d
25 mm
D
37 mm
B
10 mm
a
15.9 mm
d1 max.
28.3 mm
Da max.
35 mm
da min.
27 mm
ra max.
0.3 mm
r min
0.3 mm
α
25°
Weight
25 gr
Cr
6000 N
Cor
5600 N
Cur
280 N
Rpm
9500
Reference Speed
10300

Price

MSRP € TBD,- per piece   (expect something between € 39,- and € 49,- incl. 21% V.A.T.)