Bottom bracket advice request

[bladesman73]

Hi, I have yet to service a BB and wanted to start on my old hybrid, this bike... https://www.tritoncycles.co.uk/urba.../marin-san-rafael-ds1-hybrid-bike-2016-p14110

Any suggestions as to what tools i need and what replacement bracket i will need are most welcome.
Thanks

 

[Cycleops]

There are no servicable parts in the BB. It's a sealed unit, square taper, so unless it's worn out in which case you replace it, there's nothing to do.

 

[SheilaH]

What is wrong with the BB? If it is smooth, and there is no play then best left. If not, get a BB tool, an adjustable spanner, and whip it out (Right hand side has a left-handed thread) and replace with one that has same length axle

 

[T4tomo]

they also last for years, especially the old square taper varieties

 

[Big John]

^^^^^^^^
What they said 👍

 

[Ming the Merciless]

When the BB needs servicing it’s time to replace the bike

 

[Ajax Bay]

this bike... https://www.tritoncycles.co.uk/urba.../marin-san-rafael-ds1-hybrid-bike-2016-p14110
Any suggestions as to what tools i need [to 'service its BB] and what replacement bracket i will need

It has a "Bottom Bracket: Sealed Cartridge Bearing, Square Taper" - from your link.
I'd echo the 'if working OK, leave it be' messages (above).
Sheila has given you the tool list. It may not come out easily - the BB 20-spline tool has a weak interface with the threaded BB sleeve and after 5 years the steel and aluminium will resist divorce.
A replacement BB will need to be the correct width (68mm or 73mm) and its spindle will need to be the same as you have currently.
The BB shell width is easy to measure. The spindle less so, even once you've taken off the cranks.
A very good cartridge (Square Taper) BB is Shimano's UN-300 (the image below is a 68mm one with a 123mm spindle) - widely available (@ £20+).

 

[rogerzilla]

The spindle size is almost always printed on the sleeve - but you have to take the unit out to read it. This might mean refitting the worn one while you wait for a replacement.

 

[Ajax Bay]

the worn one

Sfaik there is no 'worn' BB in this thread (see OP). Once the cranks are off you can get a reasonable approximation of the spindle length trying to minimise parallax. But whip it out, measure/read it, clean/grease/pop it back in; ride a bit (if warm enough) and when its replacement arrives you know the old one will spin out and the job will be an assured 15 minutes.

 

[bladesman73]

It has a "Bottom Bracket: Sealed Cartridge Bearing, Square Taper" - from your link.
I'd echo the 'if working OK, leave it be' messages (above).
Sheila has given you the tool list. It may not come out easily - the BB 20-spline tool has a weak interface with the threaded BB sleeve and after 5 years the steel and aluminium will resist divorce.
A replacement BB will need to be the correct width (68mm or 73mm) and its spindle will need to be the same as you have currently.
The BB shell width is easy to measure. The spindle less so, even once you've taken off the cranks.
A very good cartridge (Square Taper) BB is Shimano's UN-300 (the image below is a 68mm one with a 123mm spindle) - widely available (@ £20+).
View attachment 573245

Thanks for the advice and to the others as well. The bb is defo done for, play in the cranks and makes a right old noise going uphill. Will get the tools and replacement bb and sort it!;

 

[Chris S]

Sfaik there is no 'worn' BB in this thread (see OP). Once the cranks are off you can get a reasonable approximation of the spindle length trying to minimise parallax. But whip it out, measure/read it, clean/grease/pop it back in; ride a bit (if warm enough) and when its replacement arrives you know the old one will spin out and the job will be an assured 15 minutes.

 

[Chislenko]

If you have digital calipers you can measure overall length just by taking cranks off.

Just got a square taper cartridge BB from Halfords for about £9.00.

 

[DRM]

View attachment 573493

The story of my life!!!

 

[DRM]

If you have digital calipers you can measure overall length just by taking cranks off.

Just got a square taper cartridge BB from Halfords for about £9.00.

Or if not put one side against a wall, and then put a flat edge against the other and measure the gap

 

[Gunk]

If it has no play just leave it alone, they are notoriously difficult to remove, this is what I had to use to remove one recently.