Cycling UK Forum

Can I get this discussion back on track rather than continue the pre-historical cycling theme please

For those of you running a 9 speed crankset (e.g. 48-36-26)/FD with 10 speed 105 STIs - could I ask if there's a problem with adjusting the front derailleur to overcome chain rubbing for the extreme gears of the rear cassette (I'm thinking 11-32 to give a bottom gear of 21 inches)?

My LBS is suggesting 10 speed 105 STI/RD with 9 speed LX FD and crankset though they have warned there may be some chain rubbing (on up to 3 gears). They don't seem too keen on the Stronglight route (perhaps they've read the Neanderthal descriptions in this thread ) Incidentally, the BB on the VN Yukon is a standard 68mm English thread.

The alternative is to keep to 9 speed as some of you have suggested.

Thanks again for your responses.

Thanks for the speedy replies.

Regarding Stronglight Impact cranksets, I was unclear about the outcome of this discussion:
viewtopic.php?f=5&t=25489 I've also seen question marks about the availability of Stronglight 38mm middle ring replacements.

I was aware of the new 11 speed 105 and am considering this to replace my SRAM Apex 10 speed (which I don't like, particularly the FD which either overshifts or does not shift on going from 34 to 50 rings) on my day bike (Van Nicolas Mistral). I'd need new 11 speed wheels too.

I do notice that the SRAM 10 speed 11-32 spacings are smaller than the 9 speed (11-32 or 11-34 - I've had both) on my audax bike. 11 speed should bring another improvement.

I don't suppose anyone has worked out a triple/11 speed solution using matching shifters? I guess 11 speed may be a bit too delicate for a tourer!

I'm thinking about a new lightweight tourer for my wife, based on a Van Nicolas Yukon. Does anyone know if there is a 48-36-26 or, even better, a 46-36-24 triple chain ring set that would be compatible with one of the Shimano 10 speed road groups - 105 or Ultegra? In particular, I'd like her to combine with a 12-30 or 11-32 10 speed cassette to give very low gears for climbing steeps (we live in the North York Moors).

I know it can be done with 9 speed (if the parts are still available?) but the gaps between adjacent gears are rather big.

We have 53-42-30 with 9 speed 11-34 on our present tourers and could easily lose the top gear in favour of the low end and smaller gaps.

Thanks,
Steve

Well, I replaced the rear tyre with the 28mm Conti GP 4 Season (folding version) and it was a tight fit (needed to use a lever) so I don't think it will come off in a hurry.

I also notice that people have measured the GP 4 Season 28mm with calipers at an actual 25 to 26 mm width so I guess they will be fine.

I also notice that people use 18-25mm inners with their 28mm tyres without problems.

Steve

Hi,

I have a pair of Racing 5 wheels (2012 vintage) for which the ETRTO size is quoted at 700C (622x15C) with a rim width quoted as 18mm. I've been running 25mm Conti Gatorskins on them but these are now past their best.

I've just bought a pair of 28mm Conti GP4 Season to replace these but I notice that the Fulcrum manual specifies only 23 or 25mm tyres with dire warnings about fitting outside this size range.

Sheldon Brown's webpage (http://sheldonbrown.com/tire-sizing.html) indicates that 15C rims should be fine for 23 to 32mm as do other sources (e.g. slowtwitch.com). So am I taking any kind of risk by putting 28mm tyres on Fulcrum Racing 5s?

And why would Fulcrum quote that tyre size range for these wheels?

Many thanks,
Steve