Chain ring upgrade-- Is it safe?

N

nubikeshop

New Member
Hey all. A build of mine has a 68.5cc with a 44 tooth rear chain ring. Gets above 30 easily, max of 39 downhill. I was curious if it would be safe to upgrade to a 36 or lower tooth chain ring. It would be cool to get some extra speed out of this thing, but would I be seriously compromising safety, structural integrity, ability to start easily, etc...?

Thanks everyone
 
a 36 will give more top-end at the cost of bottom
ie...more speed but less torque
hills will be harder and so will launch
your rpms will be lower for same cruising speed = longer engine life
hope that helped :)
 
nubikeshop said:
Hey all. A build of mine has a 68.5cc with a 44 tooth rear chain ring. Gets above 30 easily, max of 39 downhill. I was curious if it would be safe to upgrade to a 36 or lower tooth chain ring. It would be cool to get some extra speed out of this thing, but would I be seriously compromising safety, structural integrity, ability to start easily, etc...?

Thanks everyone
Click to expand...

I would say it all depends on how safe you think your bicycle is at 40 m.p.h. Most of these bikes weren't made for that for any extended period of time.
Myself, I only use the best components and some very good tires, and still don't care to go 40.m.p.h.
That is strictly my opinion!

John
 
40mph ..safe..no..a bicycle is not a motorcycle....I also use the best moving parts and the best tires..I think 30mph is pushing your luck
 
BTW...my last 2stroke had a 40tooth and I put 4000 miles on it (some KILLER hills here too !)
 
do you pedal a lot now ?
when I did mt lemon, I was on the deviate and was using a 48,,,never pedalled once
but, on the jag I pulled the trailer all over the hills here with a 40
 
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