Help please

[mintymurray]

Hi all,
complete newbie to bikes etc so please bear with me
i have been bullied into doing a sportive with my brother, the wales velothon in june next year, i currently have a boardman cx comp, so will need to put road tyres on it, i dont want to keep changing the tyres as i do go offroad with it, so i want to set up a set of Rims ( i think thats what you all call it or wheels in my case ) what would i need to buy to do this.
i think i need i need the following
Brakes currently have Tektro Lyra Mechanical Disc Brakes - 160mm fitted
cassette Shimano HG50 11-32t ( can i change this so i get more gears )
RimsMavic XM319
tyres, i think the best would be 28mm
thanks in advance
Andy the newbie

 

[Nigelnaturist]

I can't advise on wheels as I know nothing about wheels with disc brakes.
The cassette however is about as low as its likely to go on the 32th, a bit more info as into how many speeds what RD and is it a double or triple will help.you can get some cassettes up to 36th
even on road bikes but you might need to change the RD.

 

[cyberknight]

The trouble with changing wheels is that if you have different cassettes on each wheel then they will not mesh correctly with the chain and cause poor shifting or jumping as they wear as different rates .
If your just doing the odd road ride it might be easier just to change the tyres when you need them .

 

[DCLane]

An 11-32 cassette would be fine and wouldn't cause issues - and as long as it's the correct number of cogs different rims with different cassette types work; I've two sets of wheels for the main bike - one's got 12-25 and the other 11-28.

Why not get a second set of the Mavic's

Also, for road tyres you'll get different views but I use Continental GP4000s tyres

 

[Nigelnaturist]

The trouble with changing wheels is that if you have different cassettes on each wheel then they will not mesh correctly with the chain and cause poor shifting or jumping as they wear as different rates .
If your just doing the odd road ride it might be easier just to change the tyres when you need them .

Or have a chain for each cassette, they would most likely be slightly different lengths anyway.

 

[mintymurray]

cheers guys, going to get a new set of mavic's, new cassette ( same ratio ) and a new chain to match ! would 25mm tyres fit the rims i have !

 

[cyberknight]

Or have a chain for each cassette, they would most likely be slightly different lengths anyway.

Indeed although thats liable to be more hassle than changing tyres ?

 

[Dibdib]

Yeah personally I'd just change the tyres if it's just going to be the occasional road ride. You're talking a couple of hundred quid for a new set of decent wheels and for me it's really not enough of an inconvenience to justify spending that much cash.

However, if you do buy new wheels I'd strongly consider something with a narrower rim than the wheels you have now - otherwise you might find that skinny road tyres are too narrow for the rims. The Mavic rims you have now seem to be 19mm, which suggests not going much narrower than a 28mm tyre:

http://sheldonbrown.com/tire-sizing.html#width

 

[boydj]

Or have a chain for each cassette, they would most likely be slightly different lengths anyway.

I agree with Cyberknight - more hassle than it's worth. I changed wheels regularly without changing the chain. As long as you keep an eye on the chain wear and change it as soon as it gets to .75 then the cassettes will outlive several chains.

 

[Nigelnaturist]

@boydj changing a modern chain is maybe 2-3 minutes works.

 

[cyberknight]

Yup but by the time you have changed wheels and chains you could have just changed the tyres , a couple of times .

 

[Saluki]

I have 2 sets of tyres for my Defy (now the winter bike). I have bumpy tyres for when I ride along the Marriotts Way and Schwalbe Lugano tyres for road riding. It takes 5 minutes tops to change them over. I hate faffing with chain changing and reckon that switching the tyres over is way way faster.

 

[Nigelnaturist]

Takes me about 10 mins to change the Gatorskins, a wheel in less than two mins if with a different ratio cassette (not that I have a set up like that) another 3-4 to change a chain ( KMC ) depending on how many times i let go of it, usually at least once. So in the 10mins it takes to do the tyre, I could have chain and 2 wheels done give or take, it all depends what your after, the real problem would be with the chain if there is less teeth on the small cog on the cassette,

 

[simon.r]

I think you're all missing the obvious here.

This is an absolute text book case of the correct answer being n + 1

 

[Nigelnaturist]

I think you're all missing the obvious here.

This is an absolute text book case of the correct answer being n + 1

However we all cant afford ( or perhaps have the space) for n+1