Thx for the replies.

I asked the lbs about just getting a 39 ring with the current 50 and the bolt pattern /sizing is not the same. It will not fit. Thx for the link that's posted... but has same issue... states will only work w/52 ring.

Hmmm... now I wondering what gear people normally spin in now?

It was on my OLD bike that I never used the 50 ring. I used the 39 to spin.

On my CURRENT bike... I am riding the 50 ring all the time... just my cadence is not up to spinning speed. The 34 ring is fine for cadence... but not enough speed (getting no where fast).

So, do most people spin in their big 52 or 53 rings then?

I'm kinda thinking my guy buddy spins in his 39? Unless really cranking it out big time for a specific purpose etc.

I asked the shop mechanic this today... which ring he spins in (read this post earlier before shop trip, but no time to reply)... and he said "it depends". OK, I can see that. Oh... he also had the same comment that he could not tell the diff between a 52 or 53.