1985 dr250

T

tc862011

I just recently got a 1985 dr250 and I have made it trail only. I wanna bring the rear sprocket up in size to get more low end out of it, it has a 42t right now and was thinking about going to a 50. This is the first dirt bike I have owned so I need so help finding a good sprocket size and where to find a sprocket as well. Thank you for any help


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Mihylo33

Mihylo33

tc862011:
I just recently got a 1985 dr250 and I have made it trail only. I wanna bring the rear sprocket up in size to get more low end out of it, it has a 42t right now and was thinking about going to a 50. This is the first dirt bike I have owned so I need so help finding a good sprocket size and where to find a sprocket as well. Thank you for any help


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Welcome. A 44 or 46 will give you more torque but you’ll lose some top end. I had a DR back then. It was a real mellow motor.
 
2strokesteve89

2strokesteve89

For woods and mountain riding I've found that 4:1 is the ideal ratio. I.e. If you have a 13 up front I'd go with a 52 on the rear, if you are doing more wide open riding then 3.53:1 (13/46) is a good ratio you'll have decent low end pull and still have some top end left.
 
O

ossagp

On the older rigs, and especially the ones where the swingarm pivot was far from the counter shaft sprocket I tend to run the largest front sprocket that I can, and then go larger on the back to make up for that. the 4-1 ratio or there about is what I would end up with on a mx bike, but found you have more to play with in the case of a wide ratio trans like the DR's have. Usually the gear ratio you start with ends up feeling on the low side pretty soon if you are a new offroader. So you may want to wait to spend.
 
T

tc862011

Sorry about the wicked delay, I thought I was going to get notifications of when people replied and I forgot to manually check, my bad. How do I find sprockets for it? Are they usually universal mounting or is there something I should look for? Thank you for all the info. It’s more or less something to trail with. Really not expecting a ripping machine or anything.


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Mihylo33

Mihylo33

tc862011:
Sorry about the wicked delay, I thought I was going to get notifications of when people replied and I forgot to manually check, my bad. How do I find sprockets for it? Are they usually universal mounting or is there something I should look for? Thank you for all the info. It’s more or less something to trail with. Really not expecting a ripping machine or anything.
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Try here:
https://www.rockymountainatvmc.com/c/226/Drive
 
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