They never sent me a bracket for putting together the spring tension pulley so I had to take it apart and make it a stationary pulley

Have not yet tried it looks great quality

It's a great product but if your engines drive sprocket sits low, it will just kick up into the chain and pop it off. Otherwise I think this would work well. Just not for my setup.

Brock fish week

With all the other parts I got with the idler pulley everything seems to match up good. Had to get longer bolts and inside lock washers to shim the 🔩. The only question I have is to weather or not you have a special carb for the 2 stroke 66/80 cc engines.

Works better than just a fixed pulley

The moment I put this spring idler I could notice a considerable difference in the chain tightness. I actually thought it was too tight at first, Just had to adjust the spring spacing then all was good. Great product overall just wish it had 4 mounting screws like the original tensioner.

I enjoy all your products. Your a great product with a lot of choices. I will be back for more.

When trying to find an E bike for my son I had the pleasure of dealing with two service consultants. They were both excellent gave me the time needed to make an informed decision and purchase everything went smoothly. I’m sure my son will be happy with the right fit the right bicycle knowing that these two professionals helped me. Oh well done job

Marvelous!

Great product, from a reputable company. I personally recommend bike berry if you have any bike accessories needs of any kind call and ask bike berry there's staff is knowledgeable and friendly ¡

Spring allows for torque chain tension

Came on time like it the shipping date said

Waiting for the day to use it

Bought this part for redundancy, hopefully won't have to use it.

Was not happy with this item at all poor construction

Very happy I bought from Bike Berry Last year I bought a used 49cc bike from Craigslist...It vibrated until 3 mounting bolts sheared off at the motor...leaving me limping home...I looked around for a replacement motor and after researching several websites, I ordered the full 66cc Flying horse kit..Your videos and 1 on one customer service got me through the installation and I love it...smooth riding and more power..,..plus I know just about everything about building and troubleshooting a motorized bike...You guys are awesome. I just finished installing the spring idler and now there's even less vibration

Get product Chain tension with spring is ideal for constant tension on chain. Well worth the money

a must have !!!! No more worries if your chain is too tight or loose !!! I am so glad I spent my money on this !!!

good upgrade Good upgrade

good cheap tensioner Installed tensioner and went for a 30 mile ride when riding pin three beach over rough sand the spring went flying. Lost the spring. Up graded spring and no problems.great tensioner for the price.would Def recommend and have.

WHAT'S INCLUDED 1 x Performance Spring Idler Pully Upgrade Performance Spring Idler Pully Upgrade Very well i like it the only thing is that its much louder when you have the motor off but after that much better for the long hauls >>>>>>>>