Nigelnaturist
Guru
- Location
- Pontefract
so long as the advice I gave wasn't wrong , I have my RD sorted too that spacer cured quite a few noises from my last ride, its also pretty happy on the 52x24 combination though normally I am on the 40th middle at that point, but on some of the up bits it was easier just to stay on the 52th, changes are better than the Alivio as you said like a new bike, even though the RD is 6 years old, the front needs some thought though whilst its fine on the 40-52 change, the 30-40 still isn't right however there may be a few reasons for this, the BB is 115mm the original was 116mm, and the 40th middle ring isn't ramped like a lot of modern chainrings (it's not essential) it means at the moment changing from 30 to 40 means an extra nudge on the shifter, ah you may say tighten the adjuster so moves the cage across a little, if I do that I then get some chain rub on 40x28, the thing is as my kit is set up I only have two gears lower than 40x28 37.57" and they are the 30x24 and 28, the 30x21 being the same length as 40x28, the 30th however will come into play when climbing as I have 3 gears in the 40-50" range two in the 30-40" and one at 28", I dont have a single gear change longer than 8.5" .No, not really just fine tuning. The front RD needed the cable undoing before setting it up right. But the small amount of fettling had a big difference on its running/smoothness. It's actually running better now then when it was new!
I would like to thank our resident mechanic @Nigelnaturist for his guidance on fitting the chain and cassette.Cheers.
The figures in green are what you would generally use these are gear inches, the highlighted columns are the differences between each previous gear, the % is the change between each gear.
The top is what you could get with a compact double, the one below is my current setup.
Ok I lose out on the top end, but i very rarely spin at 90+rpm on 105"gear which would be 28+mph.
The thing is from Sora to 105 groupsets the FD only has 20th capacity, you need an Ultregre FD for 22th, which means to get over 101" you need the 12th sprocket.