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Hybrid to cyclocross

by shewy
Sat, Oct 28, 2017 18:23
10

How easy is it to convert my hybrid into a cyclocross? Got a Boardman team hybrid, 2x10 tiagra with hydraulic Shimano br-m477 calipers.
The bars i think would be easy as would the tyres as current are 32mm, not sure about the sti though.

If you're new please join in and if you have questions pop them below and the forum regulars will answer as best we can.

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10 comments

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shewy | 7 years ago
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So in the end I've ordered tiagra sti, and Sora mechanical discs, for £150, will keep the hydraulic just in case

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shewy | 7 years ago
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I was looking for at £120 for sti and £70 for callipers, so £170 all in, the hydraulic sti's are around £280, but may be worth it if they fit the m477 brakes

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TypeVertigo | 7 years ago
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If you can buy the hydraulic STI levers, they should work fine with your brake calipers as is. I believe the relevant part number is the ST-RS405 - it's basically the ST-RS505 STI lever with one detent removed in the rear gear shifting mechanism. That will work fine with your Tiagra 4700 mechs

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kil0ran replied to TypeVertigo | 7 years ago
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TypeVertigo wrote:

If you can buy the hydraulic STI levers, they should work fine with your brake calipers as is. I believe the relevant part number is the ST-RS405 - it's basically the ST-RS505 STI lever with one detent removed in the rear gear shifting mechanism. That will work fine with your Tiagra 4700 mechs

 

This. Shouldn't need anything else. Take the opportunity to replace your shifter cables and you're good to go.

You'd probably miss hydraulics if you drop down to mechanical and as you also need the STIs you'd just as well go with hydro. The alternative is going to be more expensive - £100 used for the mechanical levers plus around £125 for a set of hybrid cable-actuated hydros like the Juin Tech R1s

Oh, one more thing - you'll maybe need a bleed kit because you'll be opening the system to do the swap.

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shewy | 7 years ago
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Having a look the back derailleur has 4700 stamped on it, so looks like that.
Want drops so to winter train in a semi road position as got a 100 mile sportif coming up in March

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BehindTheBikesheds replied to shewy | 7 years ago
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shewy wrote:

Having a look the back derailleur has 4700 stamped on it, so looks like that. Want drops so to winter train in a semi road position as got a 100 mile sportif coming up in March

can get that position on flats and I've done a 100 miler on a flat bar too.

Just curious why you thought it necessary.

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kil0ran | 7 years ago
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Current generation Tiagra 4700 has a different pull ratio to 4600 and earlier (its now the same as the 11-speed groups) so you need to know what generation your derailleurs are.

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BehindTheBikesheds | 7 years ago
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Why do you think you need to swap to drops for CX?

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shewy | 7 years ago
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Yeah was thinking as it's 2x10 tiagra fitting 2x10 tiagra road sti and then changing the brake callipers to Sora mechanical disc, or cx77.

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CXR94Di2 | 7 years ago
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It's all to do with the pull ratio on the new levers and your current derailleurs. I suspect they are different, so careful selection of sti levers or replace levers and derailleurs together.

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