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I'm trying to build a new set of wheels for touring trip (2 months) I have planned and can only find a Tiagra FH-RS400 hub. The issues is that my shifters are Claris 3x8 ST-2403-L and cannot support 10 or 11 speed.

Can I use an 8 speed cassette on the Tiagra hub and if so what size spacer would I need?

Thank you in advance!

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    The spacer you need is 1.85mm. Web search for '11 speed hub spacer' yields what you need. Apr 25, 2020 at 10:31

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The hub for 8 to 10 speed are the same. You are good to go. You should not need any spacer for them.

However, if you mean this hub https://bike.shimano.com/en-US/product/component/tiagra-4700/FH-RS400.html they say it is a 10/11 speed hub and hence you need a (1.85 mm, as mentioned in a comment) spacer for 8 to 10 speed for this one. Those are included by some shops.

Because it is a Shimano hub you can also verify the compatibility in the official chart https://productinfo.shimano.com/#/com?cid=C-453&acid=C-454

A similar hub which is simply 8/9/10 speed would be (Sora) FH-RS300. It could also be cheaper.

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  • For touring it's probably best to avoid the cheapest parts
    – ojs
    Apr 25, 2020 at 10:59
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    @ojs I do not believe there is anything wrong with Shimano hubs at this level. It is certainly is not anything cheapest one could buy. I see the listed price for RS300 is 30€, for RS400 it is 40€. One could go much cheaper and Shimano hubs have good reputation in general. And I never said the OP should buy RS300, I poited it out as an alternative that is made for 8 speed without a spacer. Apr 25, 2020 at 11:12
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    In his time, Sheldon Brown really recommended the Tiagra hubs bikeforums.net/bicycle-mechanics/… Of course, a lot might have changed since then. But the reputation of Shimano hubs in general is great. The price level to chose is up to everyone's individual choice. Apr 25, 2020 at 13:42
  • I you pay attention, you'll notice that Tiagra is not the bargain series (that is Sora). In my experience there was large difference between the cheapest and mid-tier Shimano hubs, and as you already noticed, the price difference is 10 to 20 €.
    – ojs
    Apr 25, 2020 at 18:15
  • @ojs If you pay attention "I never said the OP should buy RS300, I pointed it out as an alternative that is made for 8 speed without a spacer." "The price level to choose is up to everyone's individual choice." Apr 25, 2020 at 18:24

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