Help Fat & slow

bobpowar

O.k. I need to know what's the cheapest way I can lower the gearing on my bike,
I cannot get up the hills :oops: trying to loose weight and not very fit at the moment.
The bike is a boardman road pro carbon with a 53/39t & 12-25t at the rear i am trying to avoid
changing the Front chain set.
Can I fit a new rear cassette? If so what size?

thecrofter

Please refer to rule 10 and rule 5

http://www.velominati.com/the-rules/

hodge68

Am i right in thinking its got shimano 5700 cassette and the rest ultegra. In which case couldn't you fit a 105 12-27 or ultegra 11-28. I changed my 105 to 12-28 tiagra from 105 12-25 and it made enough of a difference to help this fat bloke up the hills, that said my chain ring is a compact. Workshop should help, try in the search on cassette change.
Im still fat and slow, but loving it.

ALaPlage

An 11-28 may help a little in achieving rule number 5

16mm

Your rear mech will have a max sprocket size that it can take. You'll be able to search online for this.
So it's either a bigger sprocket, or a bigger sprocket and new mech.
Either way you may also need a new (longer) chain to cope.
If you really don't want to put a compact on, you could try a smaller rear wheel:-)

OR just avoid the hills till you're fitter?

bobpowar

Looks like I better man up :shock:

verylonglegs

What sort of hills are we talking? May help folk with their answers.

hodge68

I think the 6700 short cage has max tooth of 33 ( long 37) so if my maths are correct you have 52-39 eq 13 leaving you with a difference of 20 on the cassette, so surely you could go into the low 30s, as i said try the workshop thread, because i could be talking out my ar## . :shock:

cougie

Ultegra 6700 has a max sprocket of 27 apparently. So get that.

If its still not enough - look into a smaller inner chainring ? You should be able to go to a 37.