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Bike maintenance for dummies.

0 lurkers | 71 watchers
9:00am, 23 Oct 2014
18203 posts
'one of the design limitations for the frame is going to be making the frame work with commonly available kit or they won't sell many bikes!'

I love that as a concept. Sadly not how the beloved bike industry works. They are more along the lines of 'let's build something and have custom things made for it then our customers will struggle when whatever it is breaks or wears out'. And as for custom bearings... Is there time for a 27.5 mud tyre rant? Oh, no, there isn't - I need to go to work.

The problem with the angle of dangle of the front mech is also to do with gear ratios and how the chain clears the plate in the cage. And that's the bit that can vary quite a lot depending on age of bike. And can't really be bent into shape.
9:29am, 23 Oct 2014
1101 posts

Ooh! Are we going to talk about chain line?

(Quote from the internet... "In its most basic definition chainline is the line of the chain...")
10:27am, 23 Oct 2014
2650 posts
SW - as the owner if a bike with a non standard headset I hear what you say. But if I look at websites like chain reactoon, wiggle, evans etc I see that almost all of the bikes are made with standard parts or even exactly the same parts and only differ by the logo.

Re chainring size, well - yes of course if the size if the chainring is changed radically or if a bike is designed with a very big or very small chain ring in the first place this changes the angle the front mech engages the chain. (In any case it might make some designs of front mech foul on the frame).

It remains the case however that as far as chainstay angle is concerned almost all road bikes use front mechs with the same spec and almost all traditional 26inch mountain bikes uses a front mech that has a slightly different angle. 29ers either have an adaptor or use the road bike angle. So for practical purposes the answer to the OP is buy one that is generically correct for the type of bike and it will work almost all of the time.

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A thread for your questions about fixing common bike problems.

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