Cyclocross - Chain rub on guard... ideas?

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Kirkdig

11-17-07, 11:42 AM

I've recently switched my bike to a single chainring. All in all I really like it, but my chain rubs in the two smallest cogs of my cassette. I need those two cogs when on the road since I'm running such a small chainring.

Configuration:
TruVativ Elita Cross GXP External Bottom Bracket
39T mounted on the inside
BBG Bashguard mounted outside - 42T max
Redline Chain Keeper
SRAM PG950 9 spd cassette, 12-26

What are some suggestions to try? Guard and chainring closer to the same size? Longer spindle? Washers to push the guard out a bit?

TIA! Kirk

crossthreaded

11-17-07, 03:39 PM

I run a "similar" single chainring 36t w/ 42t franken-grind guard. But I haven't noticed any rub on the guard. I think the washers/spacers inside the guard would be the easiest/cheapest way to go. You may want to get sets of various gauges to eliminate the dreaded "gotta go back to the shop again":mad:. Hope you solve the problem.

Milice

11-17-07, 09:16 PM

What is your chainline like? It may be possable that you need to install a size larger bottom bracket.

~stella

11-17-07, 11:12 PM

What is your chainline like? It may be possable that you need to install a size larger bottom bracket.

OP said they have an exo bottom bracket.

washers/spacers are your friend...

Milice

11-18-07, 06:49 AM

OP said they have an exo bottom bracket.

washers/spacers are your friend...

Correct, we had to space out a friends redline.