nerdy bolt question

Discussion in 'Bicycle Mechanics and Repairs' started by Kirstie, 31 Jul 2007.

  1. Hello everyone.
    I'd like some help with bolt sizes please...I would like to replace all the steel bolts on my tourer with titanium ones. This is essentially because I am an unashamed bike tart, plus I love my tourer and I'd like to treat it to some nice bolts. There's also a job lot going on ebay here and here ;)

    I'd ask that you overlook the fact that I am a nerdy saddo for a moment and consider the following question: how do I find out the right thread size for an ultra galaxy frame to see if either of these bolts would work? There are M5 and M6 bolts on an ultra I think.
  2. mosschops2

    mosschops2 New Member

    M5/M6 bolts etc - refers to the external diameter of the threads. To state the obvious, the metric and (bsp) imperial systems are most common for nuts and bolts, although there are a couple of other systems in use - quite common (!!) in the world of high pressure hydraulics, known as "pipe fittings" should you ever want to google it!!!

    Now, if you were keen (or desparate) you can get what is an equivalent of "feeler gauges" for threads, which looks like one of those allan-key pen-knives. This has several different sets - for metric, for bsp imperial, also maybe unified, bsf, bsw etc etc.

    What I would be tempted to do, if you were looking to check out what bolts are on your bike, might be to buy a thread gauge (which I always type guage btw), but more easily, you could buy a box of nuts, which you could get from an online toolshop, I bought some like these only cheaper - i.e. for a tenner, you should be able to get about 15-20 different nut sizes, which is cheaper than buying in ones from B&Q. I can't recall the company I bought a small box load from - basically because I needed a couple of good sized nuts for some reason... A decent hardware store might sort you out.... might be easier!!
    (If you're really desperate I can check my emails at home - I'm sure I have the order confirmation somewhere!!)
  3. OP

    Kirstie Über Member

    Now that's a good idea...thanks.
  4. mosschops2

    mosschops2 New Member

    No worries. Also - forgot to mention - the thread gauges are a bugger to use!!! Nuts are easier for sure!!
  5. mosschops2

    mosschops2 New Member

    Was answering a question about cable locks, and came across the company in question. I bought the hex nut set. Which is pretty cheap, and has a good enough selection to get you going!!
  6. Rather than playing with mosschop's nuts you could kill the fun by finding out what stem, mudguard etc is on your bike...from Dawes perhaps - or 'the bike shop'?

    You could always play with the nuts in your spare time then - or save them for another thread:tongue:
  7. robgul

    robgul Guru

    Cut to the chase here - if the bike is less than about 20 years old then the bolts will be metric (as in M5 etc) and will fit.

    However, the idea of Titanium bolts at the sort of cost they are makes little sense to me ..... but then I suppose you'll save soem weight, although getting a haircut before riding would probably save more than the difference in the bolts ;)

  8. ...haircut is not 'bling' rob (In my case it's not even needed!;) )

    Kirstie wants what a woman wants...:biggrin:
  9. P.H

    P.H Über Member

    Those screws on Ebay are 25mm long, that's a lot longer than you need for most bike applications. Either you'll have fun cutting titanium or you'll leave them at that length and no lighter than steel.
    If you really want to save weight on a touring bike, there are better ways, maybe worth another thread. First suggestion the titanium rack from Tubus,mmm
  10. llllllll

    llllllll New Member

    Have a look here:

    Much bigger range than the Ebay seller and they should be a bit cheaper, though it'll still be expensive to replace a whole bikes worth. The website isn't the easiest to use but I've brought from them before and the service was very good.
  11. starseven

    starseven Guest

    Im not sure how much more Kirstie knows than to begin with, or how much Im going to help!!

    Arent there just 2 sizes of bolt :

    Frame stuff, racks , bottles etc which are M? x length.
    Stems, brakes, ders, seatpost clamp etc which are M? x length.

    Im interested in this one for the even shallower reason of getting some new bolts that are all the same allen key size!!!

    A big bag of stainless jobbies will do me though.
  12. llllllll

    llllllll New Member

    Generally racks, water bottles etc are M5. Stem, seat post clamp etc are M6. However there's a lot of exceptions to the rule and some very odd sizes out there.
  13. OP

    Kirstie Über Member

    Thanks for your suggestions and advice, and for the predictable innuendos about nuts ;) I have a tubus airy on order, as it happens... and yes, as I said, I LIKE TITANIUM. The poor tourer, whilst it's a lovely solid build, has no bling - ie no carbon or titanium anywhere on it and in my view this should be remedied asap. I don't buy excess shoes or bags or jewellery, I buy titanium and carbon bike bits. Now to some of you boys I'm a dream woman...

    Now go on, tell me about nuts! :biggrin:
  14. OP

    Kirstie Über Member

    Er I mean bolts, sorry.
    Got carried away there...
  15. Christopher

    Christopher Über Member

    If you do get ti bolts, remember to put anti-sieze grease on them, else they'll fuse themselves to the frame...
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