Messages

1

Gear Talk / Re: Advice for choosing components to reduce gear inches

« on: October 13, 2016, 09:30:48 am »

Thank you for your advice.

I am going to look at the Sora crankset.

Many thanks,

David.

2

Gear Talk / Re: Advice for choosing components to reduce gear inches

« on: October 12, 2016, 06:01:48 pm »

Hello everyone,

Thank you for taking time to reply to my message, I am going to look at the Sora crankset as it seems the easiest, simplist and cheapest solution.  Since I currently have 50, 39 and 30, I would like to change all of the chainrings to give me something like: 24, 34, 44, which then makes me think that an mtb crankset should work with a road front mech?  I am also aware that on SheldonBrown's website the difference in teeth between the middle and large chainring should be no more than 13 teeth.

As a thought which I had considered is choosing an mtb crankset with a road front mech feasible, would I need to chose a mtb crankset which gives a chainline of 45mm, or would I need to use a road hollowtech II BB to force the mtb chainrings to give me a chainline of 45mm?  Or am I potentially opening myself upto a whole world of pain?  Have any of you done this before? I would like to evaluate the different options before I make my decision.

I am planning on doing the changes myself and using it as a learning exercise, I have previously replaced the crankset on my old 8 speed mountain bike and regularly service and maintain the bike.  The gap in my knowledge is road components and potentially mixing road and mtb components together as I think it could be very easy to get this mixture wrong?

I think I will also aim for 24x32x700c to get the 20 gear inches to keep things simple to start with so that I can start doing test rides with a fully loaded bike and steep hills!

Thank you.

David.

3

Gear Talk / Re: Advice for choosing components to reduce gear inches

« on: October 11, 2016, 06:54:49 pm »

Is there a simple solution which I could be overlooking, like using a small chainring in replacement for the 30T or another solution?

4

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.