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Genetic Karyotype JIS Bottom Bracket

Now £31.48
Save 10% RRP: £34.99
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3 reviews
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Product Description

  • High quality traditional style Cr-Mo JIS square axle BB with precision cartridge bearings lightweight forged Alloy cups and Carbon Fibre spacer.

  • Supplied with Hex cap type bolts.

  • 103, 107 or 110.5mm sizes.

  • A great choice for that ultimate lightweight fixie machine.

  • Weight 230g

Genetic Karyotype JIS Bottom Bracket Reviews

Write your own review
Overall Rating:
3.9
out of 5
3.89
Build Quality
4.17
Performance
4
Value For Money
3.17

Customer Reviews (3)

4
Sturdy and light

Lightweight alternative to Shimano UN55 (as others have mentioned) as well as Miche Primato BB. Silent, smooth, and sturdy, performs well without any noticeable wear so far. On any discounted price is good value for money. On RRP ok value for money, but definitely worth it for the weight weenies out there.

Lightweight alternative to Shimano UN55 (as others have mentioned) as well as Miche Primato BB. Silent, smooth, and sturdy, performs well without any noticeable wear so far. On any discounted price is good value for money. On RRP ok value for money, but definitely worth it for the weight weenies out there.

Close review
4 out of 5
Build Quality: 4.5/5
Performance: 4/5
Value For Money: 3.5/5
4
Good alternative for Shimano

Buying my third one. The first seemed to show some wear on the bearings before the bike was stolen. Second one seems fine but wrong length for new frame. This is much lighter than the Shimano UN55 (and more expensive), but haven't had a chance to test longevity. Seems good so far and the first one was subjected to some well-laden touring. Fits easily and smoothly into the frame, little rotational resistance, stays shiny!

Buying my third one. The first seemed to show some wear on the bearings before the bike was stolen. Second one seems fine but wrong length for new frame. This is much lighter than the Shimano UN55 (and more expensive), but haven't had a chance to test longevity. Seems good so far and the first one was subjected to some well-laden touring. Fits easily and smoothly into the frame, little rotational resistance, stays shiny!

Close review
3.7 out of 5
Build Quality: 4/5
Performance: 4/5
Value For Money: 3/5
4
Genetic karyotype bottom brackets

Light weight reliable and a reasonable price for a traditional cassette square taper bottom bracket. Recommended. Good for tourers and classic bikes as well as fixies. A greater range of axle lengths would be useful.

Light weight reliable and a reasonable price for a traditional cassette square taper bottom bracket. Recommended. Good for tourers and classic bikes as well as fixies. A greater range of axle lengths would be useful.

Close review
4 out of 5
Build Quality: 4/5
Performance: 4/5
Value For Money: 3/5

Bottom Brackets Guide

What is a bottom bracket?

A bottom bracket is the bearings that the crank axle passes through, keeping the cranks turning smoothly.

Who needs a bottom bracket?

Every bike has a bottom bracket, so if your bike is creaking or feels stiff or notchy as you turn the pedals, your bottom bracket might be worn out and need replacing.

What are the choices?

It’s not so much a choice as a matter of compatibility. You need to establish whether your bottom bracket is press-fit or threaded and what size. Then you need to make sure it is compatible with your crankset. If it’s worn out, replacing like for like is often the easiest thing to do.

What should I buy with it?

You need some specialist tools both to fit and remove bottom brackets and to remove the cranks to get at it.

Anything else?

If you’re fitting a bottom bracket into a brand new frame, your frame will need some preparation first. Bottom bracket shell facing tools can be very costly, so you might need to bring it into a bike workshop to get this done.

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We will give you a full refund or exchange on any item that is returned to us unused/unfitted, in a resaleable condition and in its original packaging (where possible).

Please note: For hygiene reasons, we cannot accept returns of facemasks, undershorts or underwear if the item has been removed/unsealed from its original packaging.

If your item develops a fault or arrives damaged, please contact us first so we can resolve the issue for you as quickly as possible.

For more information please visit our Returns & Warranty page.