94 specialized ground control full suspension

 

[Street Ryderz]

It does have it's peddals the position there are in in that pic is hard to tell! the mega range set is 34-11 here is a pic with the next tank I am going to use and you can see the peddals !lol thanks yours is very well done and thought out aswell!

 

[Mrmotion]

It's hard to tell. Kinda looks like really short cranks on ryderz's machine

?? cranks ?? Don't see any ?

 

[Street Ryderz]

It still has the stock one piece peddal cranks I think they are 170mm but not positive.

 

[Street Ryderz]

Here is the gears and bearing block Im going to use I took a piece of frame tube that was close to 1 3/8 id but had to put it in the lathe and turn it 5 thou for the bearings to fit now I just need to make my gussets and mount it up! I also weighed the whole assembly with the extra length of shaft (not cut yet)and was happy to see that it was 2.8 lbs so when the shaft is cut to size and i loose 2.5 lbs of 415 chain I actually wont add any weight!

 

[Mrmotion]

Nice work , is that 17t -10t on the jack shaft ? where did you get your freewheel sprocket ? what's the final drive ratio ?

 

[Street Ryderz]

The engine side is 16t and the drive to wheel is a 12t with a 16t free wheel for the pedals.the drive ratios will be from 15.3 - 8.7 to 1. And the free wheel along with all the gears,shaft,bearings,ect came from Stanton inc

 

[Mrmotion]

Nice work , is that 17t -10t on the jack shaft ? where did you get your freewheel sprocket ? what's the final drive ratio ?

BMI KARTS.com has a good jackshaft ratio calculator , check it out its
ber: 26862"]Nice work , is that 17t -10t on the jack shaft ? where did you get your freewheel sprocket ? what's the final drive ratio ?[/QUOTE]

The engine side is 16t and the drive to wheel is a 12t with a 16t free wheel for the pedals.the drive ratios will be from 15.3 - 8.7 to 1. And the free wheel along with all the gears,shaft,bearings,ect came from Stanton inc

Thanks for the info , My bike likes a 3.77:1 top gear = 50mph @ 8400 rpm . same ratio as 38t rear 10t engine sprocket without a Jackshaft . The sbp shift kit actually has 2 jackshafts from a technical stand point , I'm thinking of getting rid of the front freewheel and do it the way your bike is setup with the freewheel on the jack shaft . The engine power doesn't have to go through the pedal crank (front freewheel) sprocket and chain waisting power to the wheels . In your setup the (third chain) is only used for pedaling and starting , right ?

 

[Street Ryderz]

Yes your right!

 

[Mrmotion]

Yes your right!

Thanks for the info and ideas ! , My SBP ultra heavyduty cost $140 , a single speed freewheel cost $25 + up . I got a new build for spring , It's A 1997 hand made All aluminum CNC frame from one of those boutique bike company's in California , super lightweight , think I'm going to try your setup with the freewheel on the jackshaft . I'LL post some pics -Thanks again

 

[Street Ryderz]

Thanks for the info and ideas ! , My SBP ultra heavyduty cost $140 , a single speed freewheel cost $25 + up . I got a new build for spring , It's A 1997 hand made All aluminum CNC frame from one of those boutique bike company's in California , super lightweight , think I'm going to try your setup with the freewheel on the jackshaft . I'LL post some pics -Thanks again

That sounds cool!just to verify though 3.77 to 1 is added to the 4.1 reduction in the engine and with a 26"wheel at 8400 rpm and that ratio would =41.7 mph