chain guide block dropper for larger spockets

[marth30]

hi everyone this is my first post (of many prob)

i recently bought a 50 tooth sprocket for my crm250 and i have found that i need to get a dropper block for the chain guide. i was thinking about making one myself but was wondering if anyone had the specs and sizes of the one made by leisure trail.

has anyone made one before and if so how did you guys do it.. i am on a tight budget thats the only reason i don't want to buy it.

thanks

[back off road]

viewtopic.php?f=6&t=5993&p=37521&hilit= ... per#p37521

heres a link to what you want ,its always a good idea to use the search facility on the forum and the FAQs as alot of subjects have been covered before

[marth30]

ok i have used the search tool and found most of what i needed but i had to take the chain guide off because of rubbing and now im not sure if i should ride it on the road without one.. well until i get a dropper block made at my friends workshop on the weekend. so at the moment i have the bike ready to go but i need to know if it is safe as i dont want to hurt myself or my crm

i found out alot about not riding off road without a chain guide but would riding on road pose the same problems?

[twistednuts]

It has one an must be there for a reason i guess.

You'll be thinkin about it whilst ridin aswell, i think id be puttin the other sprocket back on till you get your dropper made

[fallenmikethebike]

There is of course also the easier and cheaper solution of buying a smaller front sprocket, say a 12, or 13.
One tooth of the front is roughly equal to 3 teeth ON the back sprocket.
I have often stated that IMO, a 14-42 combination will tackle most tasks asked of it, though i know not what your area of riding is, though this is open to dispute by others.
Mike

[Mudfacetony]

13:45 I've found to be the optimum combo. pulls good and decent top end

[maciej_mi]

I have question about front sprocket, does anybody ride with 12 tooth front sprocket, i think its so small and will scratch with chain? Any sugestion?

[fallenmikethebike]

Go bigger on the back, such a small front sprocket puts a strain on the chain, and the sprocket wears quicker.
Mike

[maciej_mi]

I have no quit becouse chain and rear sprocket is new, so lenght of chain is to small for 49t rear, my question is. It is possible to go on 12t on front, will chain scratch on sprocket lock?

[fallenmikethebike]

12 will work, but using a soft link you could lengthen the chain easily.
Mike

[maciej_mi]

It's extra costs , i ordered 12t, i'll try, if will be very bad i sell and try to do what you suggest fallenmikethebike

[Bultacobob]

I found that 13t sprocket was as small as you can go and even this was wearing the retaining plates edges off as the chain sits lower. Although new to these bikes I also have found on my MK3 13-45 to be the optimum gearing, but setting it up for 14-45 on the chain length gave me a quick swap if I needed higher gearing, i.e mainly flat work like Salisbury Plain. I would in fact recommend going 14-48. This takes the mechanical stress of the chain and front drive bearings, you will however need to fit the rear chain guide dropper. I will be going this route on my next chain & sprocket renewal.