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Gear Talk / Advice for choosing components to reduce gear inches
« on: October 11, 2016, 05:26:37 pm »
Hello,
I have just purchased myself a new touring bike Genesis Tour De Fer 20 (2017 model). I love the bike but I have one problem, the gear inches are too high with a 30T on the small chainring with a 32T on the cassette with a 700C wheel giving about 25 gear inches and I would like to ask you all to provide the best options which I can use to reduce the gear inches to below 20. I plan to use the bike which will most likely involve a lot of steep hills with a lot of weight. The bike is 10 speed and comes with Tiagra 4703 groupset and I like the STI levers (I don't want to change these), it has Deore rear hub and I am confused with the chainline and what components to use as it is currently all road components but I realise that I possibly need to mix road and mtb components to achieve this?
I believe I need to keep the tiagra front mech (as this works with the STI shifters), use a mtb crankset, have a mtb 9 speed xt rear deraillure and a mtb 36T cassette - the problem I foresee will be the chainline - how can I maintain the chainline of 45mm since the front mech works to this, but most mtb cranksets are 50mm? Would I need to choose a crankset which uses the tapered BB or is there a way that I can use a hollowtech 2 BB?
I would welcome any advice you can help me to choose the components to reduce the gear inches while keeping my STI shifters.
Thank you in advance.
David.
I have just purchased myself a new touring bike Genesis Tour De Fer 20 (2017 model). I love the bike but I have one problem, the gear inches are too high with a 30T on the small chainring with a 32T on the cassette with a 700C wheel giving about 25 gear inches and I would like to ask you all to provide the best options which I can use to reduce the gear inches to below 20. I plan to use the bike which will most likely involve a lot of steep hills with a lot of weight. The bike is 10 speed and comes with Tiagra 4703 groupset and I like the STI levers (I don't want to change these), it has Deore rear hub and I am confused with the chainline and what components to use as it is currently all road components but I realise that I possibly need to mix road and mtb components to achieve this?
I believe I need to keep the tiagra front mech (as this works with the STI shifters), use a mtb crankset, have a mtb 9 speed xt rear deraillure and a mtb 36T cassette - the problem I foresee will be the chainline - how can I maintain the chainline of 45mm since the front mech works to this, but most mtb cranksets are 50mm? Would I need to choose a crankset which uses the tapered BB or is there a way that I can use a hollowtech 2 BB?
I would welcome any advice you can help me to choose the components to reduce the gear inches while keeping my STI shifters.
Thank you in advance.
David.