1990’s Schlumpf Speed Drive crankset. Used, fully functional. The crank arms appear to be slightly off or bent. Tested and everything works properly. Speed-drive makes the chainring spinning at a higher rate. This means, that a 38 tooth chainring, if speed-drive is engaged, works like a 1.65 times larger one (63 tooth chainring). If you have a 44 tooth chainring, with speed-drive engaged this chainring would equal a huge 73 tooth chainring. That's why speed-drive is often used for fast bikes like recumbents, or folding bikes, where it compensates for the small rear wheel.
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110BCD Sprocket 4 Bolts Narrow Wide Chainring Road Bike High-end Closed Disc 4claws Chainwheel Bicycle Crank Single Tooth Disc
Aliexpress UK
NEW Genuine SE Bikes 1 piece, single speed 33 Tooth Chainring. The SE alloy sprocket will translate all your power into pure power. The design has the feel of an SE logo mixed with a throwing star. You can’t go wrong with that!
eBay
MUQZI 4/5PCS Chainring Bolts Single Double Chainring Screws Mountain Road MTB Bike Crank Bolts 6.5/8.5mm
Aliexpress UK
Chainring: 40/42/44/46/48T. The products are all taken in physical form. Process: Full CNC processing, anode sandblasting. Weight:About 516g(165mm).
eBay
Deemount M8 Threaded Bolts for Single Double Triple Bicycle Chainring 6.5/8.5mm Height MTB Road Crankset Fixing Nuts
Aliexpress UK
The 12-speeds of range is new to Shimano lineup and gets a quality crank to match.
eBay
SNAIL Bike Chainring Bolts 6.5/8.5mm Chainwheel Screws Single/double Chain Ring Bolts Square/Round for Crankset Screw Parts
Aliexpress UK
2-piece BMX cranks, drive-side with integrated 5-bolt spider for 110 mm BCD chainrings and spindle for GXP bottom bracket. Excellent crank set for BMX or any 1x single-chainring set-up.
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MOTSUV MTB Bicycle Round Shape Narrow Wide Chainwheel 32T/34T/36T/38T 104BCD Chainring Bike Circle Crankset Single Plate Parts
Aliexpress UK
【Faster dispatch and delivery time】After the customer places the order, we can send it out within 1 working day and reach the delivery within 1-3 working days generally.【Better after-sales service】If you have any questions, you can contact us at any time, and we will reply you within 24 hours! Description: Brand:KRSEC Material: stainless steel Color: Multicolor, Silver Specification: 6.5/8.5mm(for single/double speed); Weight: 5.4g/pc,approx; Package:4pcs/5pcs-box Features: 1.colorful bolts: stainless steel, titanium plating , more rust-proof durable, cool fashion 2.Easy to install,which is convenient to use. 3.Commonly used on mountain bikes for two-piece disc locking. 4.Lightweight, tough and durable, it can be used for a long time.
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VXM MTB Bike Bicycle 104BCD 32T 34T 36T 38T 40T42T Aluminum Crankset Protector Plate Single Disc Chainwheel Gear Protector Cover
Aliexpress UK
104bcd CNC 32T MTB Bike Crankset BB Narrow Wide Chainring 170mm Bicycle Crank. Condition is New. Shipped with USPS Ground Advantage.
eBay
BUCKLOS 4pc 5pc Chainring Bolts 6.5mm 8.5mm Bike Chainwheel Screws Aluminum Alloy Bicycle Plate Screw for Single/double Crankset
Aliexpress UK
Arm Length: 152mm 165mm. 1 Pair Crank Set. 1 Pair Crank Set, 1 Piece BB Bottom Bracket. 1 Pair Crank Set, 1 Piece BB Bottom Bracket, 1 Piece Chainring. Chainwheel Tooth: 44T. Hollow design, which is lightweight, adding no heaviness to you bike, make riding more comfortable and relaxing.
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GOLDIX 12S Narrow Wide Chainring for Shimano FC-M6100/7100/8100/9100 Direct Mount Crank 34T/36T/38T/40T/42T Single Chainwheel
Aliexpress UK