Gear shifting on 30 speed
I have read threads before about how to use the gears with the 3 chain wheels at the front and not cross threading. Years ago I owned a MTG bike with 3 x 7 Alivio drive train and a friend advised me of this so I used to mainly use the small chainring for 1-3 on the rear, middle chain ring for 3-5 and big chainring for 5-7. So my 21 speed bike was really a 9 speed.
Just wondering how far you should push it on the modern 3 x 10 setups. I have a fairly new bike with the Deore drivetrain and I am trying to do something similar but have found that if I go as far as gear 5 on the rear whilst on the small front chain ring I haven't noticed any chain rubbing or adverse effects.
So should I still use the same principle i.e. small chainring on front 1-3 on rear, middle chainring on front 3-8 on rear, large chainring on front 8-10 on rear? So my vaunted 30 speed is really a 12 speed bike! LOL Or is it safe to go a little further without risk of adverse performance or chain wear?
What your friend told you was never accurate so it certainly doesn't apply to 30 spd. You should be able to use the full range of gears through the middle chainring. Then on the top and bottom, I usually recommend not using the extreme two gears, but there's no hard and fast rule. The less cross chained you ride, the theoretically longer the chain could last.
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Originally Posted by zebrahum
That's interesting. What I used to do may not be exactly what my friend told me but that's just what I did. From what you're saying though there's a much greater range of gears available.
Originally Posted by zebrahum
I have 3x9 and the middle ring I also use my full range in the rear. I try to keep out of the smallest 3 when on the small chain ring and out of the biggest 3 when on the big chain ring. This is to limit cross chaining.
I use my chain rings depend on what I am riding.
Middle ring for most riding. Flats or moderate climbs and most descents
Little ring for longer extended climbs. Even with some ration overlap to the middle ring I like to fine tune my cadence on rear derailuer and being in the little ring works great to adapt to grade changes on most climbs.
Big ring for pavement or really smooth fire roads. Also on fast descents to reduce chain slap I get from middle ring/small cog combo. By using larger ring in front and larger in back the chain is pulled away from the frame.
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