Description
“After over a year of testing we are pleased to release our Oval Chain Ring”
Does a mechanical advantage of increased gearing sound Interesting? If so read on.
Through research and testing of many different prototypes with varying amounts of Ovality we found 115% (from the top centre) to be the optimum.
This shrank the dead spot suitably and gave the same flawless chain retention and silence as our round rings. The shortening of the dead spot on the top and bottom of the power curve allows you to get back into the power phase of your crank rotation sooner.
The benefit of this is twofold; increased gearing on the downward stroke and faster crank speed to get the crank propelled back around into the power phase continually. This is a significant gain because virtually all studies into pedalling performance suggest that a minimum 80% of your power comes from the down ward motion. Mainly because much larger muscle groups are used for this motion. The physics sorcery essentially adds extra power in the down wards stroke for no extra effort by reducing the dead spot and adds a bigger gear for the now larger power phase in the downward stroke. Win win.
All of our Chain Rings are + / - 2 Teeth so;
30T Has a combination of 32T Increased Power Phase and 28T Dead Spot
32T Has a combination of 34T Increased Power Phase and 30T Dead Spot
We would recommend sticking to the current sized round ring that you are currently using when selecting your Oval size.
Burgtec Oval Thick Thin Chainring
“After over a year of testing we are pleased to release our Oval Chain Ring”
Does a mechanical advantage of increased gearing sound Interesting? If so read on.
Through research...
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Description
“After over a year of testing we are pleased to release our Oval Chain Ring”
Does a mechanical advantage of increased gearing sound Interesting? If so read on.
Through research and testing of many different prototypes with varying amounts of Ovality we found 115% (from the top centre) to be the optimum.
This shrank the dead spot suitably and gave the same flawless chain retention and silence as our round rings. The shortening of the dead spot on the top and bottom of the power curve allows you to get back into the power phase of your crank rotation sooner.
The benefit of this is twofold; increased gearing on the downward stroke and faster crank speed to get the crank propelled back around into the power phase continually. This is a significant gain because virtually all studies into pedalling performance suggest that a minimum 80% of your power comes from the down ward motion. Mainly because much larger muscle groups are used for this motion. The physics sorcery essentially adds extra power in the down wards stroke for no extra effort by reducing the dead spot and adds a bigger gear for the now larger power phase in the downward stroke. Win win.
All of our Chain Rings are + / - 2 Teeth so;
30T Has a combination of 32T Increased Power Phase and 28T Dead Spot
32T Has a combination of 34T Increased Power Phase and 30T Dead Spot
We would recommend sticking to the current sized round ring that you are currently using when selecting your Oval size.
Returns Information
Delivery Information
We have a range of delivery options on orders. Most importantly, if your order is over £50 then delivery is free!
All Biketart orders are fully trackable. You will get a tracking number by email when your order is shipped which will allow you to track it with Royal Mail or DPD.
In-stock orders placed by 4pm will be processed the same day.
Any items displaying "in-stock with supplier, despatched in 2-3 days" on the product page cannot be despatched the same day as they will be shipped to us from the supplier when you place your order.
Read on to discover the delivery options available to you on your order.
Delivery Services
Standard Tracked: All orders over £50 are eligible for free standard tracked delivery by Royal Mail. For orders under £50 there is a £3 charge. Orders sent using standard tracked are usually delivered in 2-3 days.
Priority Tracked: For £4 your order is sent by premium tracked delivery which gives a 1-2 day (including Saturdays) delivery timescale. This service is provided by Royal Mail who will usually deliver on Saturdays. Orders must be placed by 4pm.
Next Day Courier: If you require next-working-day delivery then this is provided by DPD and is £6.99. Orders must be placed by 3.30pm and be fully in-stock in order to be processed before our daily DPD collection.
Saturday Delivery: You can select Saturday delivery options from DPD at the checkout.
Bike Delivery: Bikes are always delivered by courier. After placing a bike order your bike is fully assembled and tested before being carefully boxed for shipping. Because of this build process it is not always possible to offer next-day delivery on a bike. Please do get in touch if you want to know a specific despatch day on any bike on our website. Call us on 01227 832582 or email support@biketart.com.
Returns Info
We offer a 30 day return period on our items. We ask that items are returned in their original packaging and in re-sellable condition. We do not pay returns postage.unless we have made an error with your order.
We cannot accept the return if the item is not correctly packaged and is damaged in transit during the return trip back to us.
Please do not stick any tape or labels to the products branded outer packaging.
Customer Reviews
- RPRichard P.Verified BuyerRated 5 out of 5 stars11 months agoPerfect
Great addition to my new bike….
- MCMr. craig m.Verified BuyerRated 5 out of 5 stars12 seconds agoChainring
My partner said she wanted to try an oval chainring on new bike as she’d previously had one. Very impressed with the quality of the burgtec product and will definitely buy other items made by them.
- MCmichael c.Verified BuyerRated 5 out of 5 stars2 weeks agoQuality kit
Helps me out when I need to climb (which I hate)
- SSstephen s.Verified BuyerRated 5 out of 5 stars1 year agoFor deore xt
Looks good quality, easy fitment at a reasonable price