General info:
ModelCanon PowerShot A570 IS
MakeCanon
Basic shot info:
Focal Length5.8 mm; equivalent: 29 mm
Aperture ValueF5
White BalanceAuto white balance
FlashFlash did not fire, auto
Metering ModeMulti-segment
Shutter Speed Value1/39 sec
ISO Speed Ratings400
Advanced shot info:
Exposure Bias Value2/3 EV
Exposure Time1/40 sec
Exposure ModeManual exposure
Max Aperture ValueF2.6
Exif-related info:
Exif Version2.20
Exif Image Width540 pixels
Exif Image Height500 pixels
Color SpacesRGB
CompressionJPEG (old-style)
User Comment
 Broken bike parts » Hubs » Rolf hub (image 1 of 3)


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Rolf hub
This front hub failed when the radial spokes tore out the flange. The hub is from a Rolf Sestriere wheel supplied with a new 2000 Trek 5900 USPS Superlight bicycle. The wheel was in storage, not even in use when failure occurred. I thank Bruce Ingle for the loan of this hub.

Radial spoking is safer with a moderate number of spokes to place less tension on a beefy hub flange. This wheel had only 20 spokes, but very high spoke tension and weak flanges left this hub prone to failure.

One odd feature of Rolf hubs is the smooth surface to engage the dropout. A serrated, steel surface is usual, to secure the wheel better.

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Photos and captions by John S. Allen
unless otherwise indicated.