My mates pushbike has broken but if I repair it then I can keep it
However, anyone out there got any specialist tools for pushbikes? I need to replace the bottom bracket (i think) basically the bit that connects the two cranks together, and get some new cranks in the process…
I have heard it needs a couple of specialised tools to get the job done, anyone around south london want to either lend me the tools or give me a hand for some teas and a lunch?
It sounds like the bottom bracket that needs replacing. It’s the axle that the cranks spin on.
You will need a crank extractor to get the cranks off the BB axle, and then a BB tool or two, depending on what type of BB it is. If it’s really old, you might need three tools. The problem is that there are several different types of tool to fit it, as each manufacturer has decided they’ve come across a better way of doing it. The most likely tool you’ll need is a ‘standard’ 20-tooth spline one.
Do you know what the bike is or have a photo of it?
Nice one guys, sounds like both of you might have what I need
It is an Rayleigh Freeride, and the Bottom Bracket is an old type that has a square bit and then the cranks were held on with an hex nut that screwed onto a bolt that came out both sides. The non-drive crank fell off as the bolt could not hold it on with any good capacity (kept tightening it up but fell off as a regular occurance…)
will def take up your offer groovy think it might fit… have PM’ed you
If the crank kept falling off, it’ll need replacing. Is that why you were looking at replacing the BB? The BB should be fine, BB axles are steel, cranks are ali so generally you can bugger up a fair few cranks before you damage the BB.
Either way, I’ve got the tools you need somewhere. I know I’ve packed them up somewhere sensible, but haven’t a clue where. I’ll have a look this eve and tomorrow. Whereabouts in London are you?
EDIT: Yeah, you’ve got the really old (or cheap) type. You’ll need a 20-tooth spline, a flat 15mm open-ended spanner and either a c-spanner or a hammer and a screwdriver. I’d reccomend replacing that with a cartridge bottom bracket. UN52s are only about £17 and would survive several nuclear wars. They’re also easier to fit. To get one you’ll need two measurements, the axle length and the shell width.
The shell width is the width of the bit of the frame the BB screws into (or the length of the tube it goes through), it’s either 68mm or 73mm.
The axle length is the length of the axle, but this is also dictated in part by the cranks you’re going to fit. If you do go for Me Groovy’s Shimano cranks, they’re reasonably standard and you’ll likely want a 113mm axle.
Humm, so I could get away with just replacing the non-chain crank (the chain one did not fall off…? that might be cheaper… But on my quick internet research I thought that the type of BB I had was an old and not very good one, and thought this could be an opportunity to upgrade it for a better one? (dunno if this is a good idea…?)
I’m in south london (clapham), but can travel anywhere…