Subway 8 bottom bracket

[Archie]

Bottom brackets seem a popular topic right now!

My workhorse bike's bottom bracket is knackered. There's loads of play in the spindle and it's creaking when putting the power on for hills and such like. Does anyone know what bottom bracket I'll need to replace it?

Cheers,
Archie

 

[ianrauk]

ok, after checking my Subway 1 I can assume that you would need a square tapered bottom bracket like 68x113 like this http://www.ribblecycles.co.uk/productdetail.asp?productcatalogue=SHIMBTBR375

To do the job you will need to remove your cranks, using one of these http://www.ribblecycles.co.uk/productdetail.asp?productcatalogue=SHIMTOOL600000000000

you can find both of these elsewhere for cheaper of you search around.

Check out this video on more information of how to do the job.
http://bicycletutor.com/cartridge-bottom-bracket/

One of my favourite jobs changing a bottom bracket

 

[Archie]

Cheers for that Ian, you've saved me the bother of finding the bicycle tutor vid for the job.

ok, after checking my Subway 1 I can assume that you would need a square tapered bottom bracket like. 68x113 square tapered like this http://www.ribblecycles.co.uk/productdetail.asp?productcatalogue=SHIMBTBR375

I'm no expert, but one thing that occurs to me is the subway 8 uses a single front chainring, whereas the 1 will have a double, so this might affect the axle length?

 

[ianrauk]

it should fit mate no problem.

 

[Archie]

Right-ho, thanks for that.

Next question, is it easy enough to get replacement bolts for the cranks? They're looking a bit rusty so I reckon I might as well replace them while I'm about it.

 

[ianrauk]

here you go

http://www.cyclesportsuk.co.uk/product_info.php?products_id=4221

 

[Archie]

It's like you've done this before.

 

[hubgearfreak]

I'm no expert, but one thing that occurs to me is the subway 8 uses a single front chainring, whereas the 1 will have a double, so this might affect the axle length?

i'm assuming that you subway 8 is a hub geared bike?
if so, you're right, the BB must match the original in length exactly.

 

[Archie]

i'm assuming that you subway 8 is a hub geared bike?
if so, you're right, the BB must match the original in length exactly.

That's right, nexus 8 hub on the rear. No choice then, I'll have to pop the cranks off tomorrow. Thanks for the tip.

 

[4F]

It's like you've done this before.

He did, about 2 weeks ago

 

[Archie]

I've popped the cranks off tonight to measure up the spindle and it's come up as a 110mm/68, so I'll order in the BB for the job this weekend.

Can any of the learned people say why the spindle length is so critical for hub geared bikes?

 

[hubgearfreak]

the most learned of all....

http://www.sheldonbrown.com/gloss_ch.html#chainline
http://www.sheldonbrown.com/fixedb.html#chainline