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Hallo

I Want To Knoe What Is The Best Gear Ratio That I Can Get For Dh Bike
38t 12-25
40t 12-32
42t 12-32

I Buy The Diablous Crank And I Got 38t...
Any Recomandations About The Rear Ratio Or Sould I Change The Frond Ring????( Please Try To Avoid Of That) :)

And Another Thing Please. Does The Ec70 Carbon Seat Post Id Good For Dh? Or Is It To Weeky.?

Thanks Alot Guys.
 

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MTB SOCAL
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38T is okay, don't use EC70 for DH

I have a 38T in front and it woks fine for me. I chose this because I can still do some pedalling and fireroad climbing if necessary. In some faster DH courses, you may want to run a bigger front ring. I had the Easton EC 70 post on my xc bike (Intense Spider) and got rid of it after 2-3 rides. I don't think it's a good choice for DH. Stick with alum - I like Thompson.
 

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I've got a 42 front with Ultegra 12-25 in back. Works great. 42/25 is fine for urban and uphill (out of saddle, but that's what lifts are for). And 42-12 is as fast as we should need, at 3.5:1. If you're going faster than that DH, just hang on and enjoy the ride, no need to pedal at that point.

I prefer the smaller cassete because I can run a slightly shorter chain allow the derailleur to tension more (105 Derailleur) reducing the need for a tensioner/retainer. I still run a modified retainer, but I have no need for more chain tension, and I've never dropped a chain.

This is on a 44lb. KHS FR-1500 w/ Junior T., Saint Cranks, etc...

Oh, and go Thomson, absolutely no Carbon in the DH scene, IMO. Carbon scares me anywhere other than a road bike. Thomson won't bust, carbon will, it's a fact.
 
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