BMX rebuilding help please!

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  • BMX rebuilding help please!
  • dan11

    Grips-flanges are not cool.

    Stem cap – quite possible the front brake went through.

    Bmxers use their foot and have no brakes.

    Get new chain and chainring. Half link chain is easier to get a good tension. Maybe get a bmx specific chain tool.

    New rear wheel with a 9t sprocket is always cool. Seems to be what you’re going for. 25t sprocket on this ratio. Rear wheels can be had cheap.

    New rear tyre

    Plastic pedals are also cool, so those shin smashing moments don’t hurt as much.

    Hope that helps.


    Nephew is down for half term and has brought his BMX with him for me to help him rebuild (ie rebuild for him) so I need a bit of help having no experience of BMXs (since I was a kid and had a chrome Raleigh).

    On first inspection:

    Grips (green) are knackered. He wants ones without the flange as they are not cool apparently.

    Stem cap – for some reason has holes in it, I am assuming someone had the cables going down though the cap but there is no longer any brakes.

    No rear brake – I tried but he won’t have one. Am I being uncool suggesting one?

    Chainring – looks shagged. It’s a blue anodised on (to match the stem and seat clamp) and has the centre hole and off centre bolt.

    BB feels okay

    Chain – it’s a half link chain, not checked the wear but assuming it’s knackered. Doesnt seem to be any way to remove it easily so going to have use a chain breaker.

    Rear sprocket and freewheel – it slips badly and the teeth are worn. I’ve not had a proper look yet but I am wondering if it’s just the lock nut it lose but due to the wear I am replacing the sprocket anyway so I assume it’s all one unit?

    Rear hub bearings – shot.

    Rear rim – he claims it keeps getting punctures and halfords had a look and claimed he needs a new rim. Not taken a proper look yet but we’ll see.

    Rear tyre – seen better days

    Pedals – bearings okay but all pins gone so needs some new ones.

    He’s got a stack of CRC vouchers I gave him and we need to get bits quickly so halfords (have sale on again) seems like a good bet also.

    Suggestions/what to look for/how to change stuff would be greatly appreciated!


    cheers dan,

    No flanges or brakes it is.

    Good point about the half link, not considered that as I normally just fit one half link on my SS to get the chain just right. I guess all half link chains look cooler too.

    I was wondering about a whole new rear wheel. He was saying the rear wheel was ‘too small’ bit don’t see how as it’s filling the frame. I am wondering if he’s been told the sprocket is too small.

    Plastic pedals are on my consideration list. Also nice and cheap.


    bump for the morning.

    Just taken the freehub off as it was slipping and it looks like the pawl springs are very weak so I assuming it’s a dead hub? can’t seem to find any way in to replace them. It is a 9T sprocket direct on the freehub and no make on the hub.

    9t on the back is usually a one piece driver

    But some do have splined (like mtb cogs)

    You can get replacement pawls etc, is it currently like the above pic?

    What make is the bike?? got a picture?


    the pawls seem to be in the hub with saw teeth on the driver. Seems a bit silly. Might take it to the bike shop tomorrow and see what they think.


    The list of stuff sounds like it’s a write-off. Before buying an parts,write it all down and price it. THEN be amazed at what’s on offer on the likes of Winstanleys etc.

    Even without labour it’s going to be quite a bit.

    Premier Icon mboy

    Hate to agree with martinxyz and be part of the throwaway society, but there’s soooooo many big bargains to be had out there on brand new old stock BMXes right now, by the time you’ve fixed all the problems on his old one, you could have bought him a pretty good spec new BMX!

    By the time you’ve spent £80 on a new rear wheel and 9T cog, £25 on a 25T chainwheel, £20 on some pedals, £30 on a rear tyre, £10 on some grips, £15 on a chain etc. you’re up to almost £200 on parts alone! 😯

    There’s some good 2013 complete BMX’s out there for £200 right now from the likes of CRC and Winstanleys… Makes you think eh!


    No rear brake – I tried but he won’t have one. Am I being uncool suggesting one?

    We have a rule in our house; no rear brake, no ride. Teen 1 removed it from our WTP Justice to be cool. This was replaced after he snapped the spring in the U brake. And I made him pay for it.

    I presume he rides to the BMX park? If he has an accident without ANY brake, he won’t have a leg to stand on, legally.

    And yes, look for a £200 reduced bike. There are some fantastic bargains at CRC. Ours was £700 down to £300, and you can see the quality.

    For what you want, a brake is £20, tyre about the same, freewheel might be £15, grips £10. I can easily see £100 spent. Unless it is a top notch chromoly frame, I wouldn’t bother.


    Just seen the replies about a new bike…yes would kind of make sense but…

    teenager who bought the bike off his mate. Therefore it’s the ‘best bike in the world’ to him. To be fair the frame is actually pretty well made and not a heavy lump like a lot of cheap ones.

    + first time I’ve seen my nephew in about a year due to family conflict. I always struggle for to buy them things as they grow up so fast so this time I got to send him some CRC vouchers when his gran sent me photos of the bmx he was buying (saw it needed new grips etc). This is the first time he’s been allowed to get the train down by himself and we’ve just spent the day paining the sheep shed, tidying up outside, playing baseball with apples and then spent this evening fixing up his bmx together.

    Even if he’s only learnt how to fix a puncture then it’s been useful but I also get the points for being able to undo every nut and bolt that he and his mates and mates dads couldn’t undo 😀

    I think I spent £51 + £7 for some ball bearings and £5 for some spokes at the LBS including the vouchers I sent him for his birthday. I paid a bit more for stuff as I’ve had a lot of work on this week so didn’t have time to take a look earlier in the week and CRC and the simply bearings got the stuff to me next day. It soon adds up but the biggest expense was the 25T chainring at £19. I’m not sure the freehub will last that long but I’ve just ridden it around the house and it’s not slipped again yet.

    He’s just been telling his mates back home on skype and he’s already planning his next trip down along with a bike jumble visit so I think that’s time and money well spent. 🙂

    Premier Icon alexpalacefan

    Nice one fella


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