Hayes 8" adaptor

master · 12-30-2004, 09:09 AM

I have an 8" Hayes adaptor for my 20 mm Marzocchi Jr T. Will this work with a Marzocchi fork with 9 mm dropouts?

switch · 12-30-2004, 10:48 AM

You can use a 9mm version on a 20mm fork with the aide of spacers, but you cannot use a 20mm adapter on a standard dropout fork because the 20mm adapter is too "thick".

master · 12-30-2004, 08:34 PM

But I looked on the Hayes parts catalog and they don't list a 9mm 8" adaptor - only a 20 mm version. And the few bike shops I called said it's because Hayes doesn't recommend using 8" on 9mm axels.

So what does that mean? If this is true, why does Specialized install 8" rotors on several of their Big Hit bikes with 9 mm axels?

switch · 12-31-2004, 01:59 AM

There definitely is a standard dropout 8" rotor adapter. I have one.

8" rotor on a standard dropout (9mm) can cause problems as the axle needs to be stronger.

12-30-2004, 09:09 AM	#1
master Registered User Join Date: Jul 2004 Location: Vancouver Posts: 42 Rep Power: 0	Hayes 8" adaptor I have an 8" Hayes adaptor for my 20 mm Marzocchi Jr T. Will this work with a Marzocchi fork with 9 mm dropouts?

12-30-2004, 10:48 AM	#2
switch two foot hucker Join Date: Nov 2002 Location: Old Buck Posts: 30,097 Rep Power: 13956917	You can use a 9mm version on a 20mm fork with the aide of spacers, but you cannot use a 20mm adapter on a standard dropout fork because the 20mm adapter is too "thick". __________________ It is easy to dodge our responsibilities, but we cannot dodge the consequences of dodging our responsibilities. - Josiah Stamp Every time I see an adult on a bicycle, I no longer despair for the future of the human race. - H.G. Wells

12-31-2004, 01:59 AM	#4
switch two foot hucker Join Date: Nov 2002 Location: Old Buck Posts: 30,097 Rep Power: 13956917	There definitely is a standard dropout 8" rotor adapter. I have one. 8" rotor on a standard dropout (9mm) can cause problems as the axle needs to be stronger. __________________ It is easy to dodge our responsibilities, but we cannot dodge the consequences of dodging our responsibilities. - Josiah Stamp Every time I see an adult on a bicycle, I no longer despair for the future of the human race. - H.G. Wells

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12-30-2004, 08:34 PM	#3
master Registered User Join Date: Jul 2004 Location: Vancouver Posts: 42 Rep Power: 0	But I looked on the Hayes parts catalog and they don't list a 9mm 8" adaptor - only a 20 mm version. And the few bike shops I called said it's because Hayes doesn't recommend using 8" on 9mm axels. So what does that mean? If this is true, why does Specialized install 8" rotors on several of their Big Hit bikes with 9 mm axels?