Compact Chain set Modifications

Question:
I modify my Dura-Ace 10 speed chain ring 53x39 into a Stronglight 38 ct and a Dura-Ace 50teeth chain ring both with 130bcd.my reason is that since there's no dura ace compact available except the Ultegra grade 50x34 which is heavy, I might as well try it. At least my scheme is that I maintain the dura ace facade, and the performance is very good and is lighter. Question: is it justified and practical?

Hi Mody,

That is a very good plan and there is nothing wrong with it and is probably the cheapest way of getting a compact set up, but will a 38 tooth chain ring be small enough? The difference between a 39 and a 38 is only 1 tooth; there is a big change of gear from 39 down to 36 and a 34 so you don't need such large sprockets at the back.

If you wait a little then you will be able to buy the new Shimano Dura-Ace compact chain set. The new 7900 chain set weighs in at 725 grams which is 15 grams lighter than the old 7800. It should be in the shops at the end of this year (2008), but is being billed as the new 2009 group set. The new chain set is said to be available in all the usual lengths and with a 50 tooth outer chain ring and a small 34 tooth chain ring on the inside, which would cover any need you would have, you can climb just about anything with a 34 tooth chain ring. On very steep descents sometimes the 50 tooth isn't enough and you spin out, but then you are not racing and descending safely is more important and freewheeling is more advisable anyway.

So the answer to your question is; yes it's a great idea and when the new Shimano Dura-Ace chain set comes on the market then you can decide if you like the compact ride and maybe you will want that small, 34 tooth chain ring and get smaller sprockets on your cassette. Let us know how you get on.