BB-UN300 Square bottom bracket - BSA
€12.90 *
€21.95
Prices incl. VAT plus shipping costs
Shimano BB-UN300 Square bottom bracket - BSA
Description
The BB-UN300 from Shimano is the official successor of the Shimano BB-UN55 bottom bracket and now comes with the second bottom bracket cap made of steel, instead of plastic and offers higher quality bearings.
Installed are ABEC 3 instead of the previously installed ABEC 1 bearings.
- Case width: 68 mm
- Axis widths: 107 mm, 110 mm, 113 mm, 115 mm, 117 mm, 118 mm, 122.5 mm, 127 mm
- Materials: steel (axle)
- Axle mount: square
- Successor to the Shimano BB-UN55 bottom bracket
- Different axle widths for cranks and chainlines
Property
| Property | Value |
|---|---|
| Housing Standard | BSA 68 mm |
| Axle Length | 107 mm, 110 mm, 113 mm, 115 mm, 117 mm, 118 mm, 122 mm, 122.5 mm, 127 mm |
| Color | Silver |
BB-UN300 Square bottom bracket - BSA
€12.90 *
€21.95
Prices incl. VAT plus shipping costs
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Evaluations
"Correct but..."
Quality is correct, shaft bearings and seals seems to be good stuff.
But the outer ring of left bearing was not perfectly centered with the centre steel spacer on mine, so when tightening the left cup, the spacer scratched the cup and made aluminium shavings. I had to remove everything, clean and assemble again...
Plus be aware that:
- the threads of the cups are very long, you'll need probably to re-thread your frame further or file some threads on the cups;
- the shoulder on the right cup is smaller than usual: only 36 mm diameter, not compatible with all frames or chainguard brackets (Shimano BB-UN55 is Ø39-40 mm as a matter of comparison).
But the outer ring of left bearing was not perfectly centered with the centre steel spacer on mine, so when tightening the left cup, the spacer scratched the cup and made aluminium shavings. I had to remove everything, clean and assemble again...
Plus be aware that:
- the threads of the cups are very long, you'll need probably to re-thread your frame further or file some threads on the cups;
- the shoulder on the right cup is smaller than usual: only 36 mm diameter, not compatible with all frames or chainguard brackets (Shimano BB-UN55 is Ø39-40 mm as a matter of comparison).