7 Speed to 9 Speed Conversion Question

[Brian Campbell]

Hi. 

I am helping a friend with a Kestrel 200 sc that is currently set up with 7-speed down tube shifters. It is a 7 speed Hyperglide cassette on a 105 level Shimano 105, FH-1055 rear hub and the rear spacing is 130mm.

He wants to covert it to bar end shifters and provided me with a set of 9 speed, indexed Microshift bar end shifters.

I am wondering if it is possible to to simply swap in a 9 speed cassette?

Also, for anyone who might know, the rear derailleur in a 105, RD-1055 what is the max cog size for that the RD can handle? 26 or 28?

Thanks!

[aeroperf]

Max cog size is listed as 28.

https://si.shimano.com/pdfs/si/SI-T-6B-000-00-ENG.pdf

[Bill Lindsay]

Brian

As with many things, how things go will depend on the details

You say that the bike is running 7sp hyperglide right now.  That would suggest a 126mm rear hub.  You claim the rear hub is a FH-1055, which is a 126mm stock rear hub.  But then you go on to claim that the rear hub is 130mm spacing.  

So, is it a FH1055 that somebody swapped the axle to 130mm later?

Is it a FH-1055 that somebody later swapped the axle and the freehub body to make it 8/9/10 speed compatible, but continued to run a 7sp cassette with a spacer, just for kicks?

Or is it actually a 126mm rear hub?

If it really is a 7sp cassette running on there, with no spacer, then a 9sp cassette just wont fit on that hub.  I think that's your first step.  Remove the existing cassette and look at what you actually have.  Take a picture and share it if you need advice.  If your rear hub doesn't have the right freehub body to take your 9-speed cassette then you may be stuck.  Sheldon Brown has the unambiguous photos of the different cassette bodies.  

Bill Lindsay

El Cerrito, CA

[Brian Campbell]

Thanks for the info! I just realized I posted this in the wrong forum. My apologies

[Brian Campbell]

Bill,

Thanks. 

[Toshi Takeuchi]

Ha! I was going to suggest cold setting the spacing to 130mm, like I did with my (steel) Bianchi, but it's a carbon fiber bike, hence the wrong forum, I guess...

Toshi

--
You received this message because you are subscribed to the Google Groups "RBW Owners Bunch" group.
To unsubscribe from this group and stop receiving emails from it, send an email to rbw-owners-bun...@googlegroups.com.
To view this discussion on the web visit https://groups.google.com/d/msgid/rbw-owners-bunch/f1887421-6527-44eb-a103-722d07a67ab1n%40googlegroups.com.

[Mark Roland]

Brian--a 10-speed cassette with one cog removed will turn your 7sp into an indexing 9sp.

On Friday, December 11, 2020 at 9:57:40 AM UTC-5 Brian Campbell wrote:

[Brian Campbell]

Thanks all!