http://si.shimano.com/php/download.php?file=pdf/ev/EV-CS-6700-2924B.pdf (3-top) http://si.shimano.com/php/download.php?file=pdf/ev/EV-CS-5700-3016.pdf (3-top) http://si.shimano.com/php/download.php?file=pdf/ev/EV-CS-4600-3143.pdf (7-top)
You want the Tiagra 4600, where the 7 biggest are joined.
Great, thanks Hippo
No! They're not on a carrier and can dig in as well.
Ultegra is what you need, and put some grease on the freehubs body.
Lastly and very importantly, torque your lockring (around 40Nm), this will hold the cog on the freehubs properly making it less likely to dig in too much.
@pifko started
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http://si.shimano.com/php/download.php?file=pdf/ev/EV-CS-6700-2924B.pdf (3-top)
http://si.shimano.com/php/download.php?file=pdf/ev/EV-CS-5700-3016.pdf (3-top)
http://si.shimano.com/php/download.php?file=pdf/ev/EV-CS-4600-3143.pdf (7-top)
You want the Tiagra 4600, where the 7 biggest are joined.