8 vs. 9 inch rear

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CptHook · #1 Post by **CptHook** » Thu Feb 23, 2006 3:22 am

Looking for some opinions. I have 9x9 Hipers right now on my rear, but Im thinking about doing more MXing this season, so Im wondering if it would be worth getting new 8 inch rear rims to run 18 inch tires on. I have also seen many members on here that are running 9 inch rear rims with 18 inch tires. It would obviously be easier if I could just keep the 9's I have now and put smaller tires on those, but if it's a big disadvantage running the larger rim, I might consider switching. What do you guys think?

Cdale_racer_669 · #2 Post by **Cdale_racer_669** » Thu Feb 23, 2006 5:13 am

i dont have any experience with 8 vs 9 but i dont seem to have any issues with a 9 inch rim and 18's. prob just a harsher ride

Derno24 · #3 Post by **Derno24** » Thu Feb 23, 2006 12:22 pm

With an 8" vs 9" you would get less rotating mass and faster accelerations. Unless you plan on doing just mx racing I would stay with the 9".

MyCannibal · #4 Post by **MyCannibal** » Thu Feb 23, 2006 1:43 pm

u lose top end.....quicker off the start with smaller tire or rim.....

Derno24 · #5 Post by **Derno24** » Thu Feb 23, 2006 4:29 pm

QUOTE

Originally posted by MyCannibal
u lose top end.....quicker off the start with smaller tire or rim.....

If the overall size of the tire is the same the rim makes no difference wether it is 8 or 9.

MyCannibal · #6 Post by **MyCannibal** » Thu Feb 23, 2006 5:07 pm

since the rim is smaller it would have to affect it somehow wouldn't it derno....?...i realize that a tire 1 size can fit either a 8 or 9 but going smaller( rim wise) wouldn't it in return spin faster regardless of the tire size...?..or am i not understanding this correctly...?....

Derno24 · #7 Post by **Derno24** » Thu Feb 23, 2006 6:27 pm

You are correct that it should spin faster due to less rotating mass, and there would be more sidewall flex too. Flex would make the suspension seems better. You know more air in the tire and all.

What I was getting at is if the Tire outer dimensions are the same on both rims then the final top speed would be no different. 18" is 18"

Canniboomer · #8 Post by **Canniboomer** » Thu Feb 23, 2006 6:34 pm

...just an FYI guys, but note the Cannondale 8" rear rims on the '03 Cannibals have a wider offset than the 9" rears... if that matters to you.

MyCannibal · #9 Post by **MyCannibal** » Thu Feb 23, 2006 7:08 pm

i got it now derno.....thanks.

RoooStEr Pops · #10 Post by **RoooStEr Pops** » Thu Feb 23, 2006 9:57 pm

and if your worried about to end just change the sproket. I am now running a 15/36

Cannondaleriders

8 vs. 9 inch rear

8 vs. 9 inch rear

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